Chapter 1 General Information

Data dictionary.  MySQL now incorporates a transactional data dictionary that stores information about database objects. In previous MySQL releases, dictionary data was stored in metadata files and nontransactional tables. For more information, see Chapter 14, MySQL Data Dictionary.

Atomic data definition statements (Atomic DDL).  An atomic DDL statement combines the data dictionary updates, storage engine operations, and binary log writes associated with a DDL operation into a single, atomic transaction. For more information, see Section 13.1.1, “Atomic Data Definition Statement Support”.

Upgrade procedure.  Previously, after installation of a new version of MySQL, the MySQL server automatically upgrades the data dictionary tables at the next startup, after which the DBA is expected to invoke mysql_upgrade manually to upgrade the system tables in the mysql schema, as well as objects in other schemas such as the sys schema and user schemas.

As of MySQL 8.0.16, the server performs the tasks previously handled by mysql_upgrade. After installation of a new MySQL version, the server now automatically performs all necessary upgrade tasks at the next startup and is not dependent on the DBA invoking mysql_upgrade. In addition, the server updates the contents of the help tables (something mysql_upgrade did not do). A new --upgrade server option provides control over how the server performs automatic data dictionary and server upgrade operations. For more information, see Section 2.11.3, “What the MySQL Upgrade Process Upgrades”.

Security and account management.  These enhancements were added to improve security and enable greater DBA flexibility in account management:

Resource management.  MySQL now supports creation and management of resource groups, and permits assigning threads running within the server to particular groups so that threads execute according to the resources available to the group. Group attributes enable control over its resources, to enable or restrict resource consumption by threads in the group. DBAs can modify these attributes as appropriate for different workloads. Currently, CPU time is a manageable resource, represented by the concept of “virtual CPU” as a term that includes CPU cores, hyperthreads, hardware threads, and so forth. The server determines at startup how many virtual CPUs are available, and database administrators with appropriate privileges can associate these CPUs with resource groups and assign threads to groups. For more information, see Section 8.12.5, “Resource Groups”.

Table encryption management.  Table encryption can now be managed globally by defining and enforcing encryption defaults. The default_table_encryption variable defines an encryption default for newly created schemas and general tablespace. The encryption default for a schema can also be defined using the DEFAULT ENCRYPTION clause when creating a schema. By default, a table inherits the encryption of the schema or general tablespace it is created in. Encryption defaults are enforced by enabling the table_encryption_privilege_check variable. The privilege check occurs when creating or altering a schema or general tablespace with an encryption setting that differs from the default_table_encryption setting, or when creating or altering a table with an encryption setting that differs from the default schema encryption. The TABLE_ENCRYPTION_ADMIN privilege permits overriding default encryption settings when table_encryption_privilege_check is enabled. For more information, see Defining an Encryption Default for Schemas and General Tablespaces.

InnoDB enhancements.  These InnoDB enhancements were added:

Character set support.  The default character set has changed from latin1 to utf8mb4. The utf8mb4 character set has several new collations, including utf8mb4_ja_0900_as_cs, the first Japanese language-specific collation available for Unicode in MySQL. For more information, see Section 10.10.1, “Unicode Character Sets”.

JSON enhancements.  The following enhancements or additions were made to MySQL's JSON functionality:

Data type support.  MySQL now supports use of expressions as default values in data type specifications. This includes the use of expressions as default values for the BLOB, TEXT, GEOMETRY, and JSON data types, which previously could not be assigned default values at all. For details, see Section 11.6, “Data Type Default Values”.

Optimizer.  These optimizer enhancements were added:

Common table expressions.  MySQL now supports common table expressions, both nonrecursive and recursive. Common table expressions enable use of named temporary result sets, implemented by permitting a WITH clause preceding SELECT statements and certain other statements. For more information, see Section 13.2.15, “WITH (Common Table Expressions)”.

As of MySQL 8.0.19, the recursive SELECT part of a recursive common table expression (CTE) supports a LIMIT clause. LIMIT with OFFSET is also supported. See Recursive Common Table Expressions, for more information.

Window functions.  MySQL now supports window functions that, for each row from a query, perform a calculation using rows related to that row. These include functions such as RANK(), LAG(), and NTILE(). In addition, several existing aggregate functions now can be used as window functions (for example, SUM() and AVG()). For more information, see Section 12.21, “Window Functions”.

Lateral derived tables.  A derived table now may be preceded by the LATERAL keyword to specify that it is permitted to refer to (depend on) columns of preceding tables in the same FROM clause. Lateral derived tables make possible certain SQL operations that cannot be done with nonlateral derived tables or that require less-efficient workarounds. See Section 13.2.11.9, “Lateral Derived Tables”.

Aliases in single-table DELETE statements.  In MySQL 8.0.16 and later, single-table DELETE statements support the use of table aliases.

Regular expression support.  Previously, MySQL used the Henry Spencer regular expression library to support regular expression operators (REGEXP, RLIKE). Regular expression support has been reimplemented using International Components for Unicode (ICU), which provides full Unicode support and is multibyte safe. The REGEXP_LIKE() function performs regular expression matching in the manner of the REGEXP and RLIKE operators, which now are synonyms for that function. In addition, the REGEXP_INSTR(), REGEXP_REPLACE(), and REGEXP_SUBSTR() functions are available to find match positions and perform substring substitution and extraction, respectively. The regexp_stack_limit and regexp_time_limit system variables provide control over resource consumption by the match engine. For more information, see Section 12.7.2, “Regular Expressions”. For information about ways in which applications that use regular expressions may be affected by the implementation change, see Regular Expression Compatibility Considerations.

Internal temporary tables.  The TempTable storage engine replaces the MEMORY storage engine as the default engine for in-memory internal temporary tables. The TempTable storage engine provides efficient storage for VARCHAR and VARBINARY columns. The internal_tmp_mem_storage_engine session variable defines the storage engine for in-memory internal temporary tables. Permitted values are TempTable (the default) and MEMORY. The temptable_max_ram variable defines the maximum amount of memory that the TempTable storage engine can use before data is stored to disk.

Logging.  Error logging was rewritten to use the MySQL component architecture. Traditional error logging is implemented using built-in components, and logging using the system log is implemented as a loadable component. In addition, a loadable JSON log writer is available. To control which log components to enable, use the log_error_services system variable. For more information, see Section 5.4.2, “The Error Log”.

Backup lock.  A new type of backup lock permits DML during an online backup while preventing operations that could result in an inconsistent snapshot. The new backup lock is supported by LOCK INSTANCE FOR BACKUP and UNLOCK INSTANCE syntax. The BACKUP_ADMIN privilege is required to use these statements.

Replication.  The following enhancements have been made to MySQL Replication:

Connection management.  MySQL Server now permits a TCP/IP port to be configured specifically for administrative connections. This provides an alternative to the single administrative connection that is permitted on the network interfaces used for ordinary connections even when max_connections connections are already established. See Section 8.12.4.1, “How MySQL Handles Client Connections”.

MySQL now provides more control over the use of compression to minimize the number of bytes sent over connections to the server. Previously, a given connection was either uncompressed or used the zlib compression algorithm. Now, it is also possible to use the zstd algorithm, and to select a compression level for zstd connections. The permitted compression algorithms can be configured on the server side, as well as on the connection-origination side for connections by client programs and by servers participating in master/slave replication or Group Replication. For more information, see Section 4.2.6, “Connection Compression Control”.

Configuration.  The maximum permitted length of host names throughout MySQL has been raised to 255 ASCII characters, up from the previous limit of 60 characters. This applies to, for example, host name-related columns in the data dictionary, mysql system schema, Performance Schema, INFORMATION_SCHEMA, and sys schema; the MASTER_HOST value for the CHANGE MASTER TO statement; the Host column in SHOW PROCESSLIST statement output; host names in account names (such as used in account-management statements and in DEFINER attributes); and host name-related command options and system variables.

Caveats:

Plugins.  Previously, MySQL plugins could be written in C or C++. MySQL header files used by plugins now contain C++ code, which means that plugins must be written in C++, not C.

C API.  The MySQL C API now supports asynchronous functions for nonblocking communication with the MySQL server. Each function is the asynchronous counterpart to an existing synchronous function. The synchronous functions block if reads from or writes to the server connection must wait. The asynchronous functions enable an application to check whether work on the server connection is ready to proceed. If not, the application can perform other work before checking again later. See Section 28.7.11, “C API Asynchronous Interface”.

Additional target types for casts.  The functions CAST() and CONVERT() now support conversions to types DOUBLE, FLOAT, and REAL. Added in MySQL 8.0.17. See Section 12.10, “Cast Functions and Operators”.

JSON schema validation.  MySQL 8.0.17 adds two functions JSON_SCHEMA_VALID() and JSON_SCHEMA_VALIDATION_REPORT() for validating JSON documents again JSON schemas. JSON_SCHEMA_VALID() returns TRUE (1) if the document validates against the schema and FALSE (0) if it does not. JSON_SCHEMA_VALIDATION_REPORT() returns a JSON document containing detailed information about the results of the validation. The following statements apply to both of these functions:

See Section 12.17.7, “JSON Schema Validation Functions”, for more information and examples.

Multi-valued indexes.  Beginning with MySQL 8.0.17, InnoDB supports the creation of a multi-valued index, which is a secondary index defined on a JSON column that stores an array of values and which can have multiple index records for a single data record. Such an index uses a key part definition such as CAST(data->'$.zipcode' AS UNSIGNED ARRAY). A multi-valued index is used automatically by the MySQL optimizer for suitable queries, as can be viewed in the output of EXPLAIN.

As part of this work, MySQL adds a new function JSON_OVERLAPS() and a new MEMBER OF() operator for working with JSON documents, additionally extending the CAST() function with a new ARRAY keyword, as described in the following list:

For detailed information about multi-valued indexes, including examples, see Multi-Valued Indexes. Section 12.17.3, “Functions That Search JSON Values”, provides information about JSON_OVERLAPS() and MEMBER OF(), along with examples of use.

Hintable time_zone.  As of MySQL 8.0.17, the time_zone session variable is hintable using SET_VAR.

Redo Log Archiving.  As of MySQL 8.0.17, InnoDB supports redo log archiving. Backup utilities that copy redo log records may sometimes fail to keep pace with redo log generation while a backup operation is in progress, resulting in lost redo log records due to those records being overwritten. The redo log archiving feature addresses this issue by sequentially writing redo log records to an archive file. Backup utilities can copy redo log records from the archive file as necessary, thereby avoiding the potential loss of data. For more information, see Redo Log Archiving.

The Clone Plugin.  As of MySQL 8.0.17, MySQL provides a clone plugin that permits cloning InnoDB data locally or from a remote MySQL server instance. A local cloning operation stores cloned data on the same server or node where the MySQL instance runs. A remote cloning operation transfers cloned data over the network from a donor MySQL server instance to the recipient server or node where the cloning operation was initiated.

The clone plugin supports replication. In addition to cloning data, a cloning operation extracts and transfers replication coordinates from the donor and applies them on the recipient, which enables using the clone plugin for provisioning Group Replication members and replication slaves. Using the clone plugin for provisioning is considerably faster and more efficient than replicating a large number of transactions. Group Replication members can also be configured to use the clone plugin as an alternative method of recovery, so that members automatically choose the most efficient way to retrieve group data from seed members.

For more information, see Section 5.6.7, “The Clone Plugin”, and Section 18.4.3.1, “Cloning for Distributed Recovery”.

Hash Join Optimization.  Beginning with MySQL 8.0.18, a hash join is used whenever each pair of tables in a join includes at least one equi-join condition. A hash join does not require indexes, and is more efficient in most cases than the block-nested loop algorithm. Joins such as those shown here can be optimized in this manner:

SELECT * 
    FROM t1 
    JOIN t2 
        ON t1.c1=t2.c1;

SELECT * 
    FROM t1
    JOIN t2 
        ON (t1.c1 = t2.c1 AND t1.c2 < t2.c2)
    JOIN t3 
        ON (t2.c1 = t3.c1)

Hash joins can also be used for Cartesian products—that is, when no join condition is specified.

You can see when the hash join optimization is being used for a particular query using EXPLAIN FORMAT=TREE or EXPLAIN ANALYZE.

Use of hash joins can be controlled using the optimizer_switch system variable' hash_join flag (on by default) as well as the HASH_JOIN and NO_HASH_JOIN optimizer hints.

The amount of memory available to a hash join is limited by the value of join_buffer_size. A hash join that requires more than this much memory is executed on disk; the number of disk files that can be used by an on-disk hash join is limited by open_files_limit.

For more information and examples, see Section 8.2.1.4, “Hash Join Optimization”.

As of MySQL 8.0.19, the hash_join optimizer switch introduced in MySQL 8.0.18 no longer has any effect. This also applies to the HASH_JOIN and NO_HASH_JOIN optimizer hints. The switch and the hint are both now deprecated and will be removed in a future MySQL release.

EXPLAIN ANALYZE Statement.  A new form of the EXPLAIN statement, EXPLAIN ANALYZE, is implemented in MySQL 8.0.18, providing expanded information about the execution of SELECT statements in TREE format for each iterator used in processing the query, and making it possible to compare estimated cost with the actual cost of the query. This information includes startup cost, total cost, number of rows returned by this iterator, and the number of loops executed.

In MySQL 8.0.20 and later, this statement also supports a FORMAT=TREE specifier. TREE is the only supported format.

See Obtaining Information with EXPLAIN ANALYZE, for more information.

Query cast injection.  In version 8.0.18 and later, MySQL now injects cast operations into the query item tree inside expressions and conditions in which the data type of the argument and the expected data type do not match. This has no effect on query results or speed of execution, but makes the query as executed equivalent to one which is compliant with the SQL standard while maintaining backwards compatibility with previous releases of MySQL.

Such implicit casts are now performed between temporal types (DATE, DATETIME, TIMESTAMP, TIME) and numeric types (SMALLINT, TINYINT, MEDIUMINT, INT/INTEGER, BIGINT; DECIMAL/NUMERIC; FLOAT, DOUBLE, REAL; BIT) whenever they are compared using any of the standard numeric comparison operators (=, >=, >, <, <=, <>/!=, or <=>). In this case, any value that is not already a DOUBLE is cast as one. Cast injection is also now performed for comparisons between DATE or TIME values and DATETIME values, where the arguments are cast whenever necessary as DATETIME.

It is possible to see when casts are injected into a given query by viewing the output of EXPLAIN ANALYZE, EXPLAIN FORMAT=JSON, or, as shown here, EXPLAIN FORMAT=TREE:

mysql> CREATE TABLE d (dt DATETIME, d DATE, t TIME);
Query OK, 0 rows affected (0.62 sec)

mysql> CREATE TABLE n (i INT, d DECIMAL, f FLOAT, dc DECIMAL);
Query OK, 0 rows affected (0.51 sec)

mysql> EXPLAIN FORMAT=TREE SELECT * from d JOIN n ON d.dt = n.i\G
*************************** 1. row ***************************
EXPLAIN: -> Inner hash join (cast(d.dt as double) = cast(n.i as double))  
(cost=0.70 rows=1)
    -> Table scan on n  (cost=0.35 rows=1)
    -> Hash
        -> Table scan on d  (cost=0.35 rows=1)

Such casts can also be seen by executing EXPLAIN [FORMAT=TRADITIONAL], in which case it is also necessary to issue SHOW WARNINGS afterwards.

Time zone support for TIMESTAMP and DATETIME.  As of MySQL 8.0.19, the server accepts a time zone offset with inserted datetime (TIMESTAMP and DATETIME) values. This offset uses the same format as that employed when setting the time_zone system variable, except that a leading zero is required when the hours portion of the offset is less than 10, and '-00:00' is not allowed. Examples of datetime literals that include time zone offsets are '2019-12-11 10:40:30-05:00', '2003-04-14 03:30:00+10:00', and '2020-01-01 15:35:45+05:30'.

Time zone offsets are not displayed when selecting datetime values.

Datetime literals incorporating time zone offsets can be used as prepared statement parameter values.

As part of this work, the value used to set the time_zone system variable is now also restricted to the range -14:00 to +14:00, inclusive. (It remains possible to assign name values to time_zone such as 'EST', 'Posix/Australia/Brisbane', and 'Europe/Stockholm' to this variable, provided that the MySQL time zone tables are loaded; see Populating the Time Zone Tables).

For more information and examples, see Section 5.1.13, “MySQL Server Time Zone Support”, as well as Section 11.2.2, “The DATE, DATETIME, and TIMESTAMP Types”.

Precise information for JSON schema CHECK constraint failures.  When using JSON_SCHEMA_VALID() to specify a CHECK constraint, MySQL 8.0.19 and later provides precise information about the reasons for failures of such constraints.

For examples and more information, see JSON_SCHEMA_VALID() and CHECK constraints. See also Section 13.1.20.7, “CHECK Constraints”.

Row and column aliases with ON DUPLICATE KEY UPDATE.  Beginning with MySQL 8.0.19, it is possible to reference the row to be inserted, and, optionally, its columns, using aliases. Consider the following INSERT statement on a table t having columns a and b:

INSERT INTO t SET a=9,b=5
    ON DUPLICATE KEY UPDATE a=VALUES(a)+VALUES(b);

Using the alias new for the new row, and, in some cases, the aliases m and n for this row's columns, the INSERT statement can be rewritten in many different ways, some examples of which are shown here:

INSERT INTO t SET a=9,b=5 AS new
    ON DUPLICATE KEY UPDATE a=new.a+new.b;

INSERT INTO t VALUES(9,5) AS new
    ON DUPLICATE KEY UPDATE a=new.a+new.b;

INSERT INTO t SET a=9,b=5 AS new(m,n)
    ON DUPLICATE KEY UPDATE a=m+n;

INSERT INTO t VALUES(9,5) AS new(m,n)
    ON DUPLICATE KEY UPDATE a=m+n;

For more information and examples, see Section 13.2.6.2, “INSERT ... ON DUPLICATE KEY UPDATE Statement”.

SQL standard explicit table clause and table value constructor.  Added table value constructors and explicit table clauses according to the SQL standard. These are implemented in MySQL 8.0.19, respectively, as the TABLE statement and the VALUES statement.

The TABLE statement has the format TABLE table_name, and is equivalent to SELECT * FROM table_name. It supports ORDER BY and LIMIT clauses ( the latter with optional OFFSET), but does not allow for the selection of individual table columns. TABLE can be used anywhere that you would employ the equivalent SELECT statement; this includes joins, unions, INSERT ... SELECT, REPLACE, CREATE TABLE ... SELECT statements, and subqueries. For example:

VALUES can be used to supply a table value to an INSERT, REPLACE, or SELECT statement, and consists of the VALUES keyword followed by a series of row constructors (ROW()) separated by commas. For example, the statement INSERT INTO t1 VALUES ROW(1,2,3), ROW(4,5,6), ROW(7,8,9) provides an SQL-compliant equivalent to the MySQL-specific INSERT INTO t1 VALUES (1,2,3), (4,5,6), (7,8,9). You can also select from a VALUES table value constructor just as you would a table, bearing in mind that you must supply a table alias when doing so, and use this SELECT just as you would any other; this includes joins, unions, and subqueries.

For more information about TABLE and VALUES, and for examples of their use, see the following sections of this documentation:

The utf8mb3 character set is deprecated. Please use utf8mb4 instead.

Because caching_sha2_password is the default authentication plugin in MySQL 8.0 and provides a superset of the capabilities of the sha256_password authentication plugin, sha256_password is deprecated and will be removed in a future MySQL version. MySQL accounts that authenticate using sha256_password should be migrated to use caching_sha2_password instead.

The validate_password plugin has been reimplemented to use the server component infrastructure. The plugin form of validate_password is still available but is deprecated and will be removed in a future version of MySQL. MySQL installations that use the plugin should make the transition to using the component instead. See Section 6.4.3.3, “Transitioning to the Password Validation Component”.

The ENGINE clause for the ALTER TABLESPACE and DROP TABLESPACE statements is deprecated.

The PAD_CHAR_TO_FULL_LENGTH SQL mode is deprecated.

AUTO_INCREMENT support is deprecated for columns of type FLOAT and DOUBLE (and any synonyms). Consider removing the AUTO_INCREMENT attribute from such columns, or convert them to an integer type.

The UNSIGNED attribute is deprecated for columns of type FLOAT, DOUBLE, and DECIMAL (and any synonyms). Consider using a simple CHECK constraint instead for such columns.

FLOAT(M,D) and DOUBLE(M,D) syntax to specify the number of digits for columns of type FLOAT and DOUBLE (and any synonyms) is a nonstandard MySQL extension. This syntax is deprecated.

The ZEROFILL attribute is deprecated for numeric data types, as is the display width attribute for integer data types. Consider using an alternative means of producing the effect of these attributes. For example, applications could use the LPAD() function to zero-pad numbers up to the desired width, or they could store the formatted numbers in CHAR columns.

For string data types, the BINARY attribute is a nonstandard MySQL extension that is shorthand for specifying the binary (_bin) collation of the column character set (or of the table default character set if no column character set is specified). In MySQL 8.0, this nonstandard use of BINARY is ambiguous because the utf8mb4 character set has multiple _bin collations, so the BINARY attribute is deprecated and support for it will be removed in a future MySQL version. Applications should be adjusted to use an explicit _bin collation instead.

The use of BINARY to specify a data type or character set remains unchanged.

The nonstandard C-style &&, ||, and ! operators that are synonyms for the standard SQL AND, OR, and NOT operators, respectively, are deprecated. Applications that use the nonstandard operators should be adjusted to use the standard operators.

The JSON_MERGE() function is deprecated. Use JSON_MERGE_PRESERVE() instead.

The SQL_CALC_FOUND_ROWS query modifier and accompanying FOUND_ROWS() function are deprecated. See the FOUND_ROWS() description for information about an alternative strategy.

Support for TABLESPACE = innodb_file_per_table and TABLESPACE = innodb_temporary clauses with CREATE TEMPORARY TABLE is deprecated as of MySQL 8.0.13.

For SELECT statements, use of an INTO clause after FROM but not at the end of the SELECT is deprecated as of MySQL 8.0.20. It is preferred to place the INTO at the end of the statement.

For UNION statements, these two variants containing INTO are deprecated as of MySQL 8.0.20:

See Section 13.2.10.1, “SELECT ... INTO Statement”, and Section 13.2.10.3, “UNION Clause”.

The mysql_upgrade client is deprecated because its capabilities for upgrading the system tables in the mysql system schema and objects in other schemas have been moved into the MySQL server. See Section 2.11.3, “What the MySQL Upgrade Process Upgrades”.

The --no-dd-upgrade server option is deprecated. It is superseded by the --upgrade option, which provides finer control over data dictionary and server upgrade behavior.

The mysql_upgrade_info file, which is created data directory and used to store the MySQL version number, is deprecated and will be removed in a future MySQL version.

The relay_log_info_file system variable and --master-info-file option are deprecated. Previously, these were used to specify the name of the relay log info log and master info log when relay_log_info_repository=FILE and master_info_repository=FILE were set, but those settings have been deprecated. The use of files for the relay log info log and master info log has been superseded by crash-safe slave tables, which are the default in MySQL 8.0.

The max_length_for_sort_data system variable is now deprecated due to optimizer changes that make it obsolete and of no effect.

These legacy parameters for compression of connections to the server are deprecated: The --compress client command-line option; the MYSQL_OPT_COMPRESS option for the mysql_options() C API function; the slave_compressed_protocol system variable. For information about parameters to use instead, see Section 4.2.6, “Connection Compression Control”.

Use of the MYSQL_PWD environment variable to specify a MySQL password is deprecated.

Use of VALUES() to access new row values in INSERT ... ON DUPLICATE KEY UPDATE is deprecated as of MySQL 8.0.20. Use aliases for the new row and columns, instead.

Because specifying ON ERROR before ON EMPTY when invoking JSON_TABLE() is counter to the SQL standard, this syntax is now deprecated in MySQL. Beginning with MySQL 8.0.20, the server prints a warning whenever you attempt to do so. When specifying both of these clauses in a single JSON_TABLE() invocation, make sure that ON EMPTY is used first.

The innodb_locks_unsafe_for_binlog system variable was removed. The READ COMMITTED isolation level provides similar functionality.

The information_schema_stats variable, introduced in MySQL 8.0.0, was removed and replaced by information_schema_stats_expiry in MySQL 8.0.3.

information_schema_stats_expiry defines an expiration setting for cached INFORMATION_SCHEMA table statistics. For more information, see Section 8.2.3, “Optimizing INFORMATION_SCHEMA Queries”.

Code related to obsoleted InnoDB system tables was removed in MySQL 8.0.3. INFORMATION_SCHEMA views based on InnoDB system tables were replaced by internal system views on data dictionary tables. Affected InnoDB INFORMATION_SCHEMA views were renamed:

After upgrading to MySQL 8.0.3 or later, update any scripts that reference previous InnoDB INFORMATION_SCHEMA view names.

The following features related to account management are removed:

The query cache was removed. Removal includes these items:

These deprecated query cache items remain deprecated, but have no effect, and will be removed in a future MySQL release:

The have_query_cache system variable remains deprecated, always has a value of NO, and will be removed in a future MySQL release.

The data dictionary provides information about database objects, so the server no longer checks directory names in the data directory to find databases. Consequently, the --ignore-db-dir option and ignore_db_dirs system variables are extraneous and are removed.

The tx_isolation and tx_read_only system variables have been removed. Use transaction_isolation and transaction_read_only instead.

The sync_frm system variable has been removed because .frm files have become obsolete.

The secure_auth system variable and --secure-auth client option have been removed. The MYSQL_SECURE_AUTH option for the mysql_options() C API function was removed.

The multi_range_count system variable is removed.

The log_warnings system variable and --log-warnings server option have been removed. Use the log_error_verbosity system variable instead.

The global scope for the sql_log_bin system variable was removed. sql_log_bin has session scope only, and applications that rely on accessing @@GLOBAL.sql_log_bin should be adjusted.

The metadata_locks_cache_size and metadata_locks_hash_instances system variables are removed.

The unused date_format, datetime_format, time_format, and max_tmp_tables system variables are removed.

These deprecated compatibility SQL modes are removed: DB2, MAXDB, MSSQL, MYSQL323, MYSQL40, ORACLE, POSTGRESQL, NO_FIELD_OPTIONS, NO_KEY_OPTIONS, NO_TABLE_OPTIONS. They can no longer be assigned to the sql_mode system variable or used as permitted values for the mysqldump --compatible option.

Removal of MAXDB means that the TIMESTAMP data type for CREATE TABLE or ALTER TABLE is treated as TIMESTAMP, and is no longer treated as DATETIME.

The deprecated ASC or DESC qualifiers for GROUP BY clauses are removed. Queries that previously relied on GROUP BY sorting may produce results that differ from previous MySQL versions. To produce a given sort order, provide an ORDER BY clause.

The EXTENDED and PARTITIONS keywords for the EXPLAIN statement have been removed. These keywords are unnecessary because their effect is always enabled.

These encryption-related items are removed:

In place of the removed encryption functions: For ENCRYPT(), consider using SHA2() instead for one-way hashing. For the others, consider using AES_ENCRYPT() and AES_DECRYPT() instead.

In MySQL 5.7, several spatial functions available under multiple names were deprecated to move in the direction of making the spatial function namespace more consistent, the goal being that each spatial function name begin with ST_ if it performs an exact operation, or with MBR if it performs an operation based on minimum bounding rectangles. In MySQL 8.0, the deprecated functions are removed to leave only the corresponding ST_ and MBR functions:

The functions described in Section 12.16.4, “Functions That Create Geometry Values from WKB Values” previously accepted either WKB strings or geometry arguments. Geometry arguments are no longer permitted and produce an error. See that section for guidelines for migrating queries away from using geometry arguments.

The parser no longer treats \N as a synonym for NULL in SQL statements. Use NULL instead.

This change does not affect text file import or export operations performed with LOAD DATA or SELECT ... INTO OUTFILE, for which NULL continues to be represented by \N. See Section 13.2.7, “LOAD DATA Statement”.

PROCEDURE ANALYSE() syntax is removed.

The client-side --ssl and --ssl-verify-server-cert options have been removed. Use --ssl-mode=REQUIRED instead of --ssl=1 or --enable-ssl. Use --ssl-mode=DISABLED instead of --ssl=0, --skip-ssl, or --disable-ssl. Use --ssl-mode=VERIFY_IDENTITY instead of --ssl-verify-server-cert options. (The server-side --ssl option remains unchanged.)

For the C API, MYSQL_OPT_SSL_ENFORCE and MYSQL_OPT_SSL_VERIFY_SERVER_CERT options for mysql_options() correspond to the client-side --ssl and --ssl-verify-server-cert options and are removed. Use MYSQL_OPT_SSL_MODE with an option value of SSL_MODE_REQUIRED or SSL_MODE_VERIFY_IDENTITY instead.

The --temp-pool server option was removed.

The ignore_builtin_innodb system variable is removed.

The server no longer performs conversion of pre-MySQL 5.1 database names containing special characters to 5.1 format with the addition of a #mysql50# prefix. Because these conversions are no longer performed, the --fix-db-names and --fix-table-names options for mysqlcheck, the UPGRADE DATA DIRECTORY NAME clause for the ALTER DATABASE statement, and the Com_alter_db_upgrade status variable are removed.

Upgrades are supported only from one major version to another (for example, 5.0 to 5.1, or 5.1 to 5.5), so there should be little remaining need for conversion of older 5.0 database names to current versions of MySQL. As a workaround, upgrade a MySQL 5.0 installation to MySQL 5.1 before upgrading to a more recent release.

The mysql_install_db program has been removed from MySQL distributions. Data directory initialization should be performed by invoking mysqld with the --initialize or --initialize-insecure option instead. In addition, the --bootstrap option for mysqld that was used by mysql_install_db was removed, and the INSTALL_SCRIPTDIR CMake option that controlled the installation location for mysql_install_db was removed.

The generic partitioning handler was removed from the MySQL server. In order to support partitioning of a given table, the storage engine used for the table must now provide its own (“native”) partitioning handler. The --partition and --skip-partition options are removed from the MySQL Server, and partitioning-related entries are no longer shown in the output of SHOW PLUGINS or in the INFORMATION_SCHEMA.PLUGINS table.

Two MySQL storage engines currently provide native partitioning support: InnoDB and NDB. Of these, only InnoDB is supported in MySQL 8.0. Any attempt to create partitioned tables in MySQL 8.0 using any other storage engine fails.

Ramifications for upgrades.  The direct upgrade of a partitioned table using a storage engine other than InnoDB (such as MyISAM) from MySQL 5.7 (or earlier) to MySQL 8.0 is not supported. There are two options for handling such a table:

At least one of the two operations just listed must be performed for each partitioned non-InnoDB table prior to upgrading the server to MySQL 8.0. Otherwise, such a table cannot be used following the upgrade.

Due to the fact that table creation statements that would result in a partitioned table using a storage engine without partitioning support now fail with an error (ER_CHECK_NOT_IMPLEMENTED), you must make sure that any statements in a dump file (such as that written by mysqldump) from an older version of MySQL that you wish to import into a MySQL 8.0 server that create partitioned tables do not also specify a storage engine such as MyISAM that has no native partitioning handler. You can do this by performing either of the following:

For more information, see Section 23.6.2, “Partitioning Limitations Relating to Storage Engines”.

System and status variable information is no longer maintained in the INFORMATION_SCHEMA. These tables are removed: GLOBAL_VARIABLES, SESSION_VARIABLES, GLOBAL_STATUS, SESSION_STATUS. Use the corresponding Performance Schema tables instead. See Section 26.12.13, “Performance Schema System Variable Tables”, and Section 26.12.14, “Performance Schema Status Variable Tables”. In addition, the show_compatibility_56 system variable was removed. It was used in the transition period during which system and status variable information in INFORMATION_SCHEMA tables was moved to Performance Schema tables, and is no longer needed. These status variables are removed: Slave_heartbeat_period, Slave_last_heartbeat, Slave_received_heartbeats, Slave_retried_transactions, Slave_running. The information they provided is available in Performance Schema tables; see Migrating to Performance Schema System and Status Variable Tables.

The Performance Schema setup_timers table was removed, as was the TICK row in the performance_timers table.

The libmysqld embedded server library is removed, along with:

The mysql_plugin utility was removed. Alternatives include loading plugins at server startup using the --plugin-load or --plugin-load-add option, or at runtime using the INSTALL PLUGIN statement.

The resolveip utility is removed. nslookup, host, or dig can be used instead.

The resolve_stack_dump utility is removed. Stack traces from official MySQL builds are always symbolized, so there is no need to use resolve_stack_dump.

The following server error codes are not used and have been removed. Applications that test specifically for any of these errors should be updated.

ER_BINLOG_READ_EVENT_CHECKSUM_FAILURE
ER_BINLOG_ROW_RBR_TO_SBR
ER_BINLOG_ROW_WRONG_TABLE_DEF
ER_CANT_ACTIVATE_LOG
ER_CANT_CHANGE_GTID_NEXT_IN_TRANSACTION
ER_CANT_CREATE_FEDERATED_TABLE
ER_CANT_CREATE_SROUTINE
ER_CANT_DELETE_FILE
ER_CANT_GET_WD
ER_CANT_SET_GTID_PURGED_WHEN_GTID_MODE_IS_OFF
ER_CANT_SET_WD
ER_CANT_WRITE_LOCK_LOG_TABLE
ER_CREATE_DB_WITH_READ_LOCK
ER_CYCLIC_REFERENCE
ER_DB_DROP_DELETE
ER_DELAYED_NOT_SUPPORTED
ER_DIFF_GROUPS_PROC
ER_DISK_FULL
ER_DROP_DB_WITH_READ_LOCK
ER_DROP_USER
ER_DUMP_NOT_IMPLEMENTED
ER_ERROR_DURING_CHECKPOINT
ER_ERROR_ON_CLOSE
ER_EVENTS_DB_ERROR
ER_EVENT_CANNOT_DELETE
ER_EVENT_CANT_ALTER
ER_EVENT_COMPILE_ERROR
ER_EVENT_DATA_TOO_LONG
ER_EVENT_DROP_FAILED
ER_EVENT_MODIFY_QUEUE_ERROR
ER_EVENT_NEITHER_M_EXPR_NOR_M_AT
ER_EVENT_OPEN_TABLE_FAILED
ER_EVENT_STORE_FAILED
ER_EXEC_STMT_WITH_OPEN_CURSOR
ER_FAILED_ROUTINE_BREAK_BINLOG
ER_FLUSH_MASTER_BINLOG_CLOSED
ER_FORM_NOT_FOUND
ER_FOUND_GTID_EVENT_WHEN_GTID_MODE_IS_OFF__UNUSED
ER_FRM_UNKNOWN_TYPE
ER_GOT_SIGNAL
ER_GRANT_PLUGIN_USER_EXISTS
ER_GTID_MODE_REQUIRES_BINLOG
ER_GTID_NEXT_IS_NOT_IN_GTID_NEXT_LIST
ER_HASHCHK
ER_INDEX_REBUILD
ER_INNODB_NO_FT_USES_PARSER
ER_LIST_OF_FIELDS_ONLY_IN_HASH_ERROR
ER_LOAD_DATA_INVALID_COLUMN_UNUSED
ER_LOGGING_PROHIBIT_CHANGING_OF
ER_MALFORMED_DEFINER
ER_MASTER_KEY_ROTATION_ERROR_BY_SE
ER_NDB_CANT_SWITCH_BINLOG_FORMAT
ER_NEVER_USED
ER_NISAMCHK
ER_NO_CONST_EXPR_IN_RANGE_OR_LIST_ERROR
ER_NO_FILE_MAPPING
ER_NO_GROUP_FOR_PROC
ER_NO_RAID_COMPILED
ER_NO_SUCH_KEY_VALUE
ER_NO_SUCH_PARTITION__UNUSED
ER_OBSOLETE_CANNOT_LOAD_FROM_TABLE
ER_OBSOLETE_COL_COUNT_DOESNT_MATCH_CORRUPTED
ER_ORDER_WITH_PROC
ER_PARTITION_SUBPARTITION_ERROR
ER_PARTITION_SUBPART_MIX_ERROR
ER_PART_STATE_ERROR
ER_PASSWD_LENGTH
ER_QUERY_ON_MASTER
ER_RBR_NOT_AVAILABLE
ER_SKIPPING_LOGGED_TRANSACTION
ER_SLAVE_CHANNEL_DELETE
ER_SLAVE_MULTIPLE_CHANNELS_HOST_PORT
ER_SLAVE_MUST_STOP
ER_SLAVE_WAS_NOT_RUNNING
ER_SLAVE_WAS_RUNNING
ER_SP_GOTO_IN_HNDLR
ER_SP_PROC_TABLE_CORRUPT
ER_SQL_MODE_NO_EFFECT
ER_SR_INVALID_CREATION_CTX
ER_TABLE_NEEDS_UPG_PART
ER_TOO_MUCH_AUTO_TIMESTAMP_COLS
ER_UNEXPECTED_EOF
ER_UNION_TABLES_IN_DIFFERENT_DIR
ER_UNSUPPORTED_BY_REPLICATION_THREAD
ER_UNUSED1
ER_UNUSED2
ER_UNUSED3
ER_UNUSED4
ER_UNUSED5
ER_UNUSED6
ER_VIEW_SELECT_DERIVED_UNUSED
ER_WRONG_MAGIC
ER_WSAS_FAILED

The deprecated INFORMATION_SCHEMA INNODB_LOCKS and INNODB_LOCK_WAITS tables are removed. Use the Performance Schema data_locks and data_lock_waits tables instead.

InnoDB no longer supports compressed temporary tables. When innodb_strict_mode is enabled (the default), CREATE TEMPORARY TABLE returns an error if ROW_FORMAT=COMPRESSED or KEY_BLOCK_SIZE is specified. If innodb_strict_mode is disabled, warnings are issued and the temporary table is created using a non-compressed row format.

InnoDB no longer creates .isl files (InnoDB Symbolic Link files) when creating tablespace data files outside of the MySQL data directory. The innodb_directories option now supports locating tablespace files created outside of the data directory.

With this change, moving a remote tablespace while the server is offline by manually modifying an .isl file is no longer supported. Moving remote tablespace files is now supported by the innodb_directories option. See Section 15.6.3.6, “Moving Tablespace Files While the Server is Offline”.

The following InnoDB file format variables were removed:

File format variables were necessary for creating tables compatible with earlier versions of InnoDB in MySQL 5.1. Now that MySQL 5.1 has reached the end of its product lifecycle, these options are no longer required.

The FILE_FORMAT column was removed from the INNODB_TABLES and INNODB_TABLESPACES Information Schema tables.

The innodb_support_xa system variable, which enables support for two-phase commit in XA transactions, was removed. InnoDB support for two-phase commit in XA transactions is always enabled.

Support for DTrace was removed.

The JSON_APPEND() function was removed. Use JSON_ARRAY_APPEND() instead.

Support for placing table partitions in shared InnoDB tablespaces was removed in MySQL 8.0.13. Shared tablespaces include the InnoDB system tablespace and general tablespaces. For information about identifying partitions in shared tablespaces and moving them to file-per-table tablespaces, see Section 2.11.5, “Preparing Your Installation for Upgrade”.

Support for setting user variables in statements other than SET was deprecated in MySQL 8.0.13. This functionality is subject to removal in MySQL 9.0.

The --ndb perror option was removed. Use the ndb_perror utility instead.

The innodb_undo_logs variable was removed. The innodb_rollback_segments variables performs the same function and should be used instead.

The Innodb_available_undo_logs status variable was removed. The number of available rollback segments per tablespace may be retrieved using SHOW VARIABLES LIKE 'innodb_rollback_segments';

As of MySQL 8.0.14, the previously deprecated innodb_undo_tablespaces variable is no longer configurable. For more information, see Section 15.6.3.4, “Undo Tablespaces”.

Support for the ALTER TABLE ... UPGRADE PARTITIONING statement has been removed.

As of MySQL 8.0.16, support for the internal_tmp_disk_storage_engine system variable has been removed; internal temporary tables on disk now always use the InnoDB storage engine. See Storage Engine for On-Disk Internal Temporary Tables,for more information.

The DISABLE_SHARED CMake option was unused and has been removed.

Acl_cache_items_count: Number of cached privilege objects. Added in MySQL 8.0.0.

Audit_log_current_size: Audit log file current size. Added in MySQL 8.0.11.

Audit_log_event_max_drop_size: Size of largest dropped audited event. Added in MySQL 8.0.11.

Audit_log_events: Number of handled audited events. Added in MySQL 8.0.11.

Audit_log_events_filtered: Number of filtered audited events. Added in MySQL 8.0.11.

Audit_log_events_lost: Number of dropped audited events. Added in MySQL 8.0.11.

Audit_log_events_written: Number of written audited events. Added in MySQL 8.0.11.

Audit_log_total_size: Combined size of written audited events. Added in MySQL 8.0.11.

Audit_log_write_waits: Number of write-delayed audited events. Added in MySQL 8.0.11.

Caching_sha2_password_rsa_public_key: caching_sha2_password authentication plugin RSA public key value. Added in MySQL 8.0.4.

Com_alter_resource_group: Count of ALTER RESOURCE GROUP statements. Added in MySQL 8.0.3.

Com_alter_user_default_role: Count of ALTER USER ... DEFAULT ROLE statements. Added in MySQL 8.0.0.

Com_clone: Count of CLONE statements. Added in MySQL 8.0.2.

Com_create_resource_group: Count of CREATE RESOURCE GROUP statements. Added in MySQL 8.0.3.

Com_create_role: Count of CREATE ROLE statements. Added in MySQL 8.0.0.

Com_drop_resource_group: Count of DROP RESOURCE GROUP statements. Added in MySQL 8.0.3.

Com_drop_role: Count of DROP ROLE statements. Added in MySQL 8.0.0.

Com_grant_roles: Count of GRANT ROLE statements. Added in MySQL 8.0.0.

Com_install_component: Count of INSTALL COMPONENT statements. Added in MySQL 8.0.0.

Com_restart: Count of RESTART statements. Added in MySQL 8.0.4.

Com_revoke_roles: Count of REVOKE ROLES statements. Added in MySQL 8.0.0.

Com_set_resource_group: Count of SET RESOURCE GROUP statements. Added in MySQL 8.0.3.

Com_set_role: Count of SET ROLE statements. Added in MySQL 8.0.0.

Com_uninstall_component: Count of UINSTALL COMPONENT statements. Added in MySQL 8.0.0.

Compression_algorithm: Compression algorithm for current connection. Added in MySQL 8.0.18.

Compression_level: Compression level for current connection. Added in MySQL 8.0.18.

Connection_control_delay_generated: How many times the server delayed a connection request. Added in MySQL 8.0.1.

Current_tls_ca: Current value of ssl_ca system variable. Added in MySQL 8.0.16.

Current_tls_capath: Current value of ssl_capath system variable. Added in MySQL 8.0.16.

Current_tls_cert: Current value of ssl_cert system variable. Added in MySQL 8.0.16.

Current_tls_cipher: Current value of ssl_cipher system variable. Added in MySQL 8.0.16.

Current_tls_ciphersuites: Current value of tsl_ciphersuites system variable. Added in MySQL 8.0.16.

Current_tls_crl: Current value of ssl_crl system variable. Added in MySQL 8.0.16.

Current_tls_crlpath: Current value of ssl_crlpath system variable. Added in MySQL 8.0.16.

Current_tls_key: Current value of ssl_key system variable. Added in MySQL 8.0.16.

Current_tls_version: Current value of tls_version system variable. Added in MySQL 8.0.16.

Firewall_access_denied: Number of statements rejected by MySQL Enterprise Firewall. Added in MySQL 8.0.11.

Firewall_access_granted: Number of statements accepted by MySQL Enterprise Firewall. Added in MySQL 8.0.11.

Firewall_cached_entries: Number of statements recorded by MySQL Enterprise Firewall. Added in MySQL 8.0.11.

Innodb_system_rows_deleted: Number of rows deleted from system schema tables. Added in MySQL 8.0.19.

Innodb_system_rows_inserted: Number of rows inserted into system schema tables. Added in MySQL 8.0.19.

Innodb_system_rows_read: Number of rows read from system schema tables. Added in MySQL 8.0.19.

Innodb_undo_tablespaces_active: The number of active undo tablespaces. Added in MySQL 8.0.14.

Innodb_undo_tablespaces_explicit: The number of user-created undo tablespaces. Added in MySQL 8.0.14.

Innodb_undo_tablespaces_implicit: The number of undo tablespaces created by InnoDB. Added in MySQL 8.0.14.

Innodb_undo_tablespaces_total: The total number of undo tablespaces. Added in MySQL 8.0.14.

Mysqlx_bytes_received_compressed_payload: Number of bytes received as compressed message payloads, measured before decompression. Added in MySQL 8.0.19.

Mysqlx_bytes_received_uncompressed_frame: Number of bytes received as compressed message payloads, measured after decompression. Added in MySQL 8.0.19.

Mysqlx_bytes_sent_compressed_payload: Number of bytes sent as compressed message payloads, measured after compression. Added in MySQL 8.0.19.

Mysqlx_bytes_sent_uncompressed_frame: Number of bytes sent as compressed message payloads, measured before compression. Added in MySQL 8.0.19.

Secondary_engine_execution_count: For future use. Added in MySQL 8.0.13.

activate_all_roles_on_login: Whether to activate all user roles at connect time. Added in MySQL 8.0.2.

admin_address: IP address to bind to for connections on administrative interface. Added in MySQL 8.0.14.

admin_port: TCP/IP number to use for connections on administrative interface. Added in MySQL 8.0.14.

audit-log: Whether to activate the audit log plugin. Added in MySQL 8.0.11.

audit_log_buffer_size: The size of the audit log buffer. Added in MySQL 8.0.11.

audit_log_compression: Audit log file compression method. Added in MySQL 8.0.11.

audit_log_connection_policy: Audit logging policy for connection-related events. Added in MySQL 8.0.11.

audit_log_current_session: Whether to audit current session. Added in MySQL 8.0.11.

audit_log_encryption: Audit log file encryption method. Added in MySQL 8.0.11.

audit_log_exclude_accounts: Accounts not to audit. Added in MySQL 8.0.11.

audit_log_file: The name of the audit log file. Added in MySQL 8.0.11.

audit_log_filter_id: ID of current audit log filter. Added in MySQL 8.0.11.

audit_log_flush: Close and reopen the audit log file. Added in MySQL 8.0.11.

audit_log_format: The audit log file format. Added in MySQL 8.0.11.

audit_log_include_accounts: Accounts to audit. Added in MySQL 8.0.11.

audit_log_password_history_keep_days: Number of days to keep archived audit log encryption passwords. Added in MySQL 8.0.17.

audit_log_policy: Audit logging policy. Added in MySQL 8.0.11.

audit_log_read_buffer_size: Audit log file read buffer size. Added in MySQL 8.0.11.

audit_log_rotate_on_size: Close and reopen the audit log file at a certain size. Added in MySQL 8.0.11.

audit_log_statement_policy: Audit logging policy for statement-related events. Added in MySQL 8.0.11.

audit_log_strategy: The audit logging strategy. Added in MySQL 8.0.11.

authentication_ldap_sasl_auth_method_name: Authentication method name. Added in MySQL 8.0.11.

authentication_ldap_sasl_bind_base_dn: LDAP server base distinguished name. Added in MySQL 8.0.11.

authentication_ldap_sasl_bind_root_dn: LDAP server root distinguished name. Added in MySQL 8.0.11.

authentication_ldap_sasl_bind_root_pwd: LDAP server root bind password. Added in MySQL 8.0.11.

authentication_ldap_sasl_ca_path: LDAP server certificate authority file name. Added in MySQL 8.0.11.

authentication_ldap_sasl_group_search_attr: LDAP server group search attribute. Added in MySQL 8.0.11.

authentication_ldap_sasl_group_search_filter: LDAP custom group search filter. Added in MySQL 8.0.11.

authentication_ldap_sasl_init_pool_size: LDAP server initial connection pool size. Added in MySQL 8.0.11.

authentication_ldap_sasl_log_status: LDAP server log level. Added in MySQL 8.0.11.

authentication_ldap_sasl_max_pool_size: LDAP server maximum connection pool size. Added in MySQL 8.0.11.

authentication_ldap_sasl_server_host: LDAP server host name or IP address. Added in MySQL 8.0.11.

authentication_ldap_sasl_server_port: LDAP server port number. Added in MySQL 8.0.11.

authentication_ldap_sasl_tls: Whether to use encrypted connections to LDAP server. Added in MySQL 8.0.11.

authentication_ldap_sasl_user_search_attr: LDAP server user search attribute. Added in MySQL 8.0.11.

authentication_ldap_simple_auth_method_name: Authentication method name. Added in MySQL 8.0.11.

authentication_ldap_simple_bind_base_dn: LDAP server base distinguished name. Added in MySQL 8.0.11.

authentication_ldap_simple_bind_root_dn: LDAP server root distinguished name. Added in MySQL 8.0.11.

authentication_ldap_simple_bind_root_pwd: LDAP server root bind password. Added in MySQL 8.0.11.

authentication_ldap_simple_ca_path: LDAP server certificate authority file name. Added in MySQL 8.0.11.

authentication_ldap_simple_group_search_attr: LDAP server group search attribute. Added in MySQL 8.0.11.

authentication_ldap_simple_group_search_filter: LDAP custom group search filter. Added in MySQL 8.0.11.

authentication_ldap_simple_init_pool_size: LDAP server initial connection pool size. Added in MySQL 8.0.11.

authentication_ldap_simple_log_status: LDAP server log level. Added in MySQL 8.0.11.

authentication_ldap_simple_max_pool_size: LDAP server maximum connection pool size. Added in MySQL 8.0.11.

authentication_ldap_simple_server_host: LDAP server host name or IP address. Added in MySQL 8.0.11.

authentication_ldap_simple_server_port: LDAP server port number. Added in MySQL 8.0.11.

authentication_ldap_simple_tls: Whether to use encrypted connections to LDAP server. Added in MySQL 8.0.11.

authentication_ldap_simple_user_search_attr: LDAP server user search attribute. Added in MySQL 8.0.11.

authentication_windows_log_level: Windows authentication plugin logging level. Added in MySQL 8.0.11.

authentication_windows_use_principal_name: Whether to use Windows authentication plugin principal name. Added in MySQL 8.0.11.

binlog_encryption: Enable encryption for binary log files and relay log files on this server. Added in MySQL 8.0.14.

binlog_expire_logs_seconds: Purge binary logs after this many seconds. Added in MySQL 8.0.1.

binlog_rotate_encryption_master_key_at_startup: Rotate the binary log master key at server startup. Added in MySQL 8.0.14.

binlog_row_metadata: Configures the amount of table related metadata binary logged when using row-based logging. Added in MySQL 8.0.1.

binlog_row_value_options: Enables binary logging of partial JSON updates for row-based replication. Added in MySQL 8.0.3.

binlog_transaction_dependency_history_size: Number of row hashes kept for looking up transaction that last updated some row. Added in MySQL 8.0.1.

binlog_transaction_dependency_tracking: Source of dependency information (commit timestamps or transaction write sets) from which to assess which transactions can be executed in parallel by slave's multithreaded applier. Added in MySQL 8.0.1.

caching_sha2_password_auto_generate_rsa_keys: Whether to autogenerate RSA key-pair files. Added in MySQL 8.0.4.

caching_sha2_password_private_key_path: SHA2 authentication plugin private key path name. Added in MySQL 8.0.3.

caching_sha2_password_public_key_path: SHA2 authentication plugin public key path name. Added in MySQL 8.0.3.

clone_autotune_concurrency: Enables dynamic spawning of threads for remote cloning operations. Added in MySQL 8.0.17.

clone_buffer_size: Defines the size of the intermediate buffer on the donor MySQL server instance. Added in MySQL 8.0.17.

clone_ddl_timeout: The number of seconds that a cloning operation waits for backup lock. Added in MySQL 8.0.17.

clone_enable_compression: Enables compression of data at the network layer during cloning. Added in MySQL 8.0.17.

clone_max_concurrency: The maximum number of concurrent threads used to perform cloning operation. Added in MySQL 8.0.17.

clone_max_data_bandwidth: The maximum data transfer rate in MiB per second for a remote cloning operation. Added in MySQL 8.0.17.

clone_max_network_bandwidth: The maximum network transfer rate in MiB per second for a remote cloning operation. Added in MySQL 8.0.17.

clone_ssl_ca: Specifies the path to the certificate authority (CA) file. Added in MySQL 8.0.14.

clone_ssl_cert: Specifies the path to the public key certificate file. Added in MySQL 8.0.14.

clone_ssl_key: Specifies the path to the private key file. Added in MySQL 8.0.14.

clone_valid_donor_list: Defines donor host addresses for remote cloning operations. Added in MySQL 8.0.17.

connection_control_failed_connections_threshold: Consecutive failed connection attempts before delays occur. Added in MySQL 8.0.1.

connection_control_max_connection_delay: Maximum delay (milliseconds) for server response to failed connection attempts. Added in MySQL 8.0.1.

connection_control_min_connection_delay: Minimum delay (milliseconds) for server response to failed connection attempts. Added in MySQL 8.0.1.

create_admin_listener_thread: Whether to use dedicated listening thread for connections on administrative interface. Added in MySQL 8.0.14.

cte_max_recursion_depth: Common table expression maximum recursion depth. Added in MySQL 8.0.3.

ddl-rewriter: Whether to activate the ddl_rewriter plugin. Added in MySQL 8.0.16.

default_collation_for_utf8mb4: Default collation for utf8mb4 character set. Added in MySQL 8.0.11.

default_table_encryption: The default schema and tablespace encryption setting. Added in MySQL 8.0.16.

dragnet.Status: Result of most recent assignment to dragnet.log_error_filter_rules. Added in MySQL 8.0.12.

dragnet.log_error_filter_rules: Filter rules for error logging. Added in MySQL 8.0.4.

early-plugin-load: Specify plugins to load before loading mandatory built-in plugins and before storage engine initialization. Added in MySQL 8.0.0.

generated_random_password_length: Maximum length of generated passwords. Added in MySQL 8.0.18.

group_replication_autorejoin_tries: Number of tries that a member makes to automatically rejoin the group. Added in MySQL 8.0.16.

group_replication_clone_threshold: The transaction number gap between the donor and recipient above which a remote cloning operation is used for state transfer. Added in MySQL 8.0.17.

group_replication_communication_debug_options: The level of debugging messages for Group Replication components. Added in MySQL 8.0.3.

group_replication_communication_max_message_size: Maximum message size for Group Replication communications, larger messages are fragmented. Added in MySQL 8.0.16.

group_replication_consistency: The type of transaction consistency guarantee which the group provides. Added in MySQL 8.0.14.

group_replication_exit_state_action: How the instance behaves when it leaves the group involuntarily. Added in MySQL 8.0.12.

group_replication_flow_control_hold_percent: Defines what percentage of the group quota remains unused. Added in MySQL 8.0.2.

group_replication_flow_control_max_commit_quota: Defines the maximum flow control quota of the group. Added in MySQL 8.0.2.

group_replication_flow_control_member_quota_percent: Defines the percentage of the quota that a member should assume is available for itself when calculating the quotas. Added in MySQL 8.0.2.

group_replication_flow_control_min_quota: Controls the lowest flow control quota that can be assigned to a member. Added in MySQL 8.0.2.

group_replication_flow_control_min_recovery_quota: Controls the lowest quota that can be assigned to a member because of another recovering member in the group. Added in MySQL 8.0.2.

group_replication_flow_control_period: Defines how many seconds to wait between flow control iterations. Added in MySQL 8.0.2.

group_replication_flow_control_release_percent: Defines how the group quota should be released when flow control no longer needs to throttle the writer members. Added in MySQL 8.0.2.

group_replication_member_expel_timeout: The time between a suspected failure of a group member and it being expelled from the group, causing a group membership reconfiguration. Added in MySQL 8.0.13.

group_replication_member_weight: Chance of this member being elected as primary. Added in MySQL 8.0.2.

group_replication_message_cache_size: Maximum memory for the message cache in the group communication engine (XCom). Added in MySQL 8.0.16.

group_replication_recovery_compression_algorithm: Permitted compression algorithms for outgoing recovery connections. Added in MySQL 8.0.18.

group_replication_recovery_get_public_key: Whether to accept preference about fetching public key from master. Added in MySQL 8.0.4.

group_replication_recovery_public_key_path: To accept public key information. Added in MySQL 8.0.4.

group_replication_recovery_tls_ciphersuites: Permitted ciphersuites when TLSv1.3 is used for connection encryption with this instance as the client (joining member). Added in MySQL 8.0.19.

group_replication_recovery_tls_version: Permitted TLS protocols for connection encryption as the client (joining member). Added in MySQL 8.0.19.

group_replication_recovery_zstd_compression_level: Compression level for recovery connections that use zstd compression. Added in MySQL 8.0.18.

group_replication_unreachable_majority_timeout: How long to wait for network partitions that result in a minority to leave the group. Added in MySQL 8.0.2.

histogram_generation_max_mem_size: Maximum memory for creating histogram statistics. Added in MySQL 8.0.2.

immediate_server_version: The MySQL Server release number of the server that is the immediate master in a replication topology. Added in MySQL 8.0.14.

information_schema_stats_expiry: Expiration setting for cached table statistics. Added in MySQL 8.0.3.

innodb_buffer_pool_debug: Permits multiple buffer pool instances when the buffer pool is less than 1GB in size. Added in MySQL 8.0.0.

innodb_buffer_pool_in_core_file: Controls writing of buffer pool pages to core files. Added in MySQL 8.0.14.

innodb_checkpoint_disabled: Disables checkpoints so that a deliberate server exit always initiates recovery. Added in MySQL 8.0.2.

innodb_ddl_log_crash_reset_debug: A debug option that resets DDL log crash injection counters. Added in MySQL 8.0.3.

innodb_deadlock_detect: Enables or disables deadlock detection. Added in MySQL 8.0.0.

innodb_dedicated_server: Enables automatic configuration of buffer pool size, log file size, and flush method. Added in MySQL 8.0.3.

innodb_directories: Defines directories to scan at startup for tablespace data files. Added in MySQL 8.0.4.

innodb_fsync_threshold: Controls how often InnoDB calls fsync when creating a new file. Added in MySQL 8.0.13.

innodb_idle_flush_pct: Limits I/0 operations when InnoDB is idle. Added in MySQL 8.0.18.

innodb_log_checkpoint_fuzzy_now: A debug option that forces InnoDB to write a fuzzy checkpoint. Added in MySQL 8.0.13.

innodb_log_spin_cpu_abs_lwm: Minimum amount of CPU usage below which user threads no longer spin while waiting for flushed redo. Added in MySQL 8.0.11.

innodb_log_spin_cpu_pct_hwm: Maximum amount of CPU usage above which user threads no longer spin while waiting for flushed redo. Added in MySQL 8.0.11.

innodb_log_wait_for_flush_spin_hwm: The maximum average log flush time beyond which user threads no longer spin while waiting for flushed redo. Added in MySQL 8.0.11.

innodb_parallel_read_threads: Defines the number of threads for parallel index reads. Added in MySQL 8.0.14.

innodb_print_ddl_logs: Whether or not to print DDL logs to the error log. Added in MySQL 8.0.3.

innodb_redo_log_archive_dirs: Labeled redo log archive directories. Added in MySQL 8.0.17.

innodb_redo_log_encrypt: Controls encryption of redo log data for encrypted tablespaces. Added in MySQL 8.0.1.

innodb_scan_directories: Defines directories to scan for tablespace files during InnoDB recovery. Added in MySQL 8.0.2.

innodb_spin_wait_pause_multiplier: Defines a multiplier value used to determine the number of PAUSE instructions in spin-wait loops. Added in MySQL 8.0.16.

innodb_stats_include_delete_marked: Include delete-marked records when calculating persistent InnoDB statistics. Added in MySQL 8.0.1.

innodb_temp_tablespaces_dir: Session temporary tablespaces path. Added in MySQL 8.0.13.

innodb_tmpdir: The directory location for the temporary table files created during online ALTER TABLE operations. Added in MySQL 8.0.0.

innodb_undo_log_encrypt: Controls encryption of undo log data for encrypted tablespaces. Added in MySQL 8.0.1.

internal_tmp_mem_storage_engine: Defines the storage to use for internal in-memory temporary tables. Added in MySQL 8.0.2.

keyring-migration-destination: Key migration destination keyring plugin. Added in MySQL 8.0.4.

keyring-migration-host: Host name for connecting to running server for key migration. Added in MySQL 8.0.4.

keyring-migration-password: Password for connecting to running server for key migration. Added in MySQL 8.0.4.

keyring-migration-port: TCP/IP port number for connecting to running server for key migration. Added in MySQL 8.0.4.

keyring-migration-socket: Unix socket file or Windows named pipe for connecting to running server for key migration. Added in MySQL 8.0.4.

keyring-migration-source: Key migration source keyring plugin. Added in MySQL 8.0.4.

keyring-migration-user: User name for connecting to running server for key migration. Added in MySQL 8.0.4.

keyring_aws_cmk_id: AWS keyring plugin customer master key ID value. Added in MySQL 8.0.11.

keyring_aws_conf_file: AWS keyring plugin configuration file location. Added in MySQL 8.0.11.

keyring_aws_data_file: AWS keyring plugin storage file location. Added in MySQL 8.0.11.

keyring_aws_region: AWS keyring plugin region. Added in MySQL 8.0.11.

keyring_encrypted_file_data: keyring_encrypted_file plugin data file. Added in MySQL 8.0.11.

keyring_encrypted_file_password: keyring_encrypted_file plugin password. Added in MySQL 8.0.11.

keyring_hashicorp_auth_path: The HashiCorp Vault AppRole authentication path. Added in MySQL 8.0.18.

keyring_hashicorp_ca_path: Path to the keyring_hashicorp CA file. Added in MySQL 8.0.18.

keyring_hashicorp_caching: Whether to enable keyring_hashicorp caching. Added in MySQL 8.0.18.

keyring_hashicorp_commit_auth_path: The actual keyring_hashicorp_auth_path value in use. Added in MySQL 8.0.18.

keyring_hashicorp_commit_ca_path: The actual keyring_hashicorp_ca_path value in use. Added in MySQL 8.0.18.

keyring_hashicorp_commit_caching: The actual keyring_hashicorp_caching value in use. Added in MySQL 8.0.18.

keyring_hashicorp_commit_role_id: The actual keyring_hashicorp_role_id value in use. Added in MySQL 8.0.18.

keyring_hashicorp_commit_server_url: The actual keyring_hashicorp_server_url value in use. Added in MySQL 8.0.18.

keyring_hashicorp_commit_store_path: The actual keyring_hashicorp_store_path value in use. Added in MySQL 8.0.18.

keyring_hashicorp_role_id: The HashiCorp Vault AppRole authentication role ID. Added in MySQL 8.0.18.

keyring_hashicorp_secret_id: The HashiCorp Vault AppRole authentication secret ID. Added in MySQL 8.0.18.

keyring_hashicorp_server_url: The HashiCorp Vault server URL. Added in MySQL 8.0.18.

keyring_hashicorp_store_path: The HashiCorp Vault store path. Added in MySQL 8.0.18.

keyring_okv_conf_dir: Oracle Key Vault keyring plugin configuration directory. Added in MySQL 8.0.11.

keyring_operations: Whether keyring operations are enabled. Added in MySQL 8.0.4.

lock_order: Whether to enable LOCK_ORDER tool at runtime. Added in MySQL 8.0.17.

lock_order_debug_loop: Whether to cause debug assert when LOCK_ORDER tool encounters dependency flagged as a loop. Added in MySQL 8.0.17.

lock_order_debug_missing_arc: Whether to cause debug assert when LOCK_ORDER tool encounters undeclared dependency. Added in MySQL 8.0.17.

lock_order_debug_missing_key: Whether to cause debug assert when LOCK_ORDER tool encounters object not properly instrumented with the Performance Schema. Added in MySQL 8.0.17.

lock_order_debug_missing_unlock: Whether to cause debug assert when LOCK_ORDER tool encounters lock that is destroyed while still held. Added in MySQL 8.0.17.

lock_order_dependencies: Path to the lock_order_dependencies.txt file. Added in MySQL 8.0.17.

lock_order_extra_dependencies: Path to a second dependency file. Added in MySQL 8.0.17.

lock_order_output_directory: Directory where LOCK_ORDER tool writes logs. Added in MySQL 8.0.17.

lock_order_print_txt: Whether to perform lock-order graph analysis and print textual report. Added in MySQL 8.0.17.

lock_order_trace_loop: Whether to print log file trace when LOCK_ORDER tool encounters dependency flagged as a loop. Added in MySQL 8.0.17.

lock_order_trace_missing_arc: Whether to print log file trace when LOCK_ORDER tool encounters undeclared dependency. Added in MySQL 8.0.17.

lock_order_trace_missing_key: Whether to print log file trace when LOCK_ORDER tool encounters object not properly instrumented with the Performance Schema. Added in MySQL 8.0.17.

lock_order_trace_missing_unlock: Whether to print log file trace when LOCK_ORDER tool encounters lock that is destroyed while still held. Added in MySQL 8.0.17.

log_error_filter_rules: Filter rules for error logging. Added in MySQL 8.0.2.

log_error_services: Components to use for error logging. Added in MySQL 8.0.2.

log_error_suppression_list: Warning/information error log messages to suppress. Added in MySQL 8.0.13.

log_slow_extra: Whether to write extra information to the slow query log file. Added in MySQL 8.0.14.

mandatory_roles: Automatically granted roles for all users. Added in MySQL 8.0.2.

mysql_firewall_mode: Whether MySQL Enterprise Firewall is operational. Added in MySQL 8.0.11.

mysql_firewall_trace: Whether to enable firewall trace. Added in MySQL 8.0.11.

mysqlx: Whether X Plugin is initialized. Added in MySQL 8.0.11.

mysqlx_compression_algorithms: Compression algorithms permitted for X Protocol connections. Added in MySQL 8.0.19.

mysqlx_interactive_timeout: Number of seconds to wait for interactive clients to timeout. Added in MySQL 8.0.4.

mysqlx_read_timeout: Number of seconds to wait for blocking read operations to complete. Added in MySQL 8.0.4.

mysqlx_wait_timeout: Number of seconds to wait for activity on a connection. Added in MySQL 8.0.4.

mysqlx_write_timeout: Number of seconds to wait for blocking write operations to complete. Added in MySQL 8.0.4.

named_pipe_full_access_group: Name of Windows group granted full access to the named pipe. Added in MySQL 8.0.14.

no-dd-upgrade: Prevent automatic upgrade of data dictionary tables at startup. Added in MySQL 8.0.4.

no-monitor: Do not fork monitor process required for RESTART. Added in MySQL 8.0.12.

original_commit_timestamp: The time when a transaction was committed on the original master. Added in MySQL 8.0.1.

original_server_version: The MySQL Server release number of the server where a transaction was originally committed. Added in MySQL 8.0.14.

partial_revokes: Whether partial revocation is enabled. Added in MySQL 8.0.16.

password_history: Number of password changes required before password reuse. Added in MySQL 8.0.3.

password_require_current: Whether password changes require current password verification. Added in MySQL 8.0.13.

password_reuse_interval: Number of days elapsed required before password reuse. Added in MySQL 8.0.3.

performance_schema_max_digest_sample_age: The query resample age in seconds. Added in MySQL 8.0.3.

persist_only_admin_x509_subject: SSL certificate X.509 Subject that enables persisting persist-restricted system variables. Added in MySQL 8.0.14.

persisted_globals_load: Whether to load persisted configuration settings. Added in MySQL 8.0.0.

print_identified_with_as_hex: For SHOW CREATE USER, print hash values containing unprintable characters in hex. Added in MySQL 8.0.17.

protocol_compression_algorithms: Permitted compression algorithms for incoming connections. Added in MySQL 8.0.18.

regexp_stack_limit: Regular expression match stack size limit. Added in MySQL 8.0.4.

regexp_time_limit: Regular expression match timeout. Added in MySQL 8.0.4.

require_row_format: For internal server use. Added in MySQL 8.0.19.

resultset_metadata: Whether the server returns result set metadata. Added in MySQL 8.0.3.

rpl_read_size: Set the minimum amount of data in bytes that is read from the binary log files and relay log files. Added in MySQL 8.0.11.

secondary_engine_cost_threshold: For future use. Added in MySQL 8.0.16.

show_create_table_skip_secondary_engine: Whether to exclude the SECONDARY ENGINE clause from SHOW CREATE TABLE output. Added in MySQL 8.0.18.

show_create_table_verbosity: Whether to display ROW_FORMAT in SHOW CREATE TABLE even if it has the default value. Added in MySQL 8.0.11.

sql_require_primary_key: Whether tables must have a primary key. Added in MySQL 8.0.13.

ssl_fips_mode: Whether to enable FIPS mode on server side. Added in MySQL 8.0.11.

syseventlog.facility: Facility for syslog messages. Added in MySQL 8.0.13.

syseventlog.include_pid: Whether to include server PID in syslog messages. Added in MySQL 8.0.13.

syseventlog.tag: Tag for server identifier in syslog messages. Added in MySQL 8.0.13.

table_encryption_privilege_check: Enables the TABLE_ENCRYPTION_ADMIN privilege check. Added in MySQL 8.0.16.

temptable_max_ram: Defines the maximum amount of memory that can occupied by the TempTable storage engine before data is stored on disk. Added in MySQL 8.0.2.

temptable_use_mmap: Defines whether the TempTable storage engine allocates memory-mapped files when the temptable_max_ram threshold is reached. Added in MySQL 8.0.16.

thread_pool_algorithm: The thread pool algorithm. Added in MySQL 8.0.11.

thread_pool_high_priority_connection: Whether the current session is high priority. Added in MySQL 8.0.11.

thread_pool_max_active_query_threads: Maximum permissible number of active query threads per group. Added in MySQL 8.0.19.

thread_pool_max_unused_threads: Maximum permissible number of unused threads. Added in MySQL 8.0.11.

thread_pool_prio_kickup_timer: How long before a statement is moved to high-priority execution. Added in MySQL 8.0.11.

thread_pool_size: Number of thread groups in the thread pool. Added in MySQL 8.0.11.

thread_pool_stall_limit: How long before a statement is defined as stalled. Added in MySQL 8.0.11.

tls_ciphersuites: Permissible TLSv1.3 ciphersuites for encrypted connections. Added in MySQL 8.0.16.

upgrade: Control automatic upgrade at startup. Added in MySQL 8.0.16.

use_secondary_engine: For future use. Added in MySQL 8.0.13.

validate-config: Validate server configuration. Added in MySQL 8.0.16.

validate_password.check_user_name: Whether to check passwords against user name. Added in MySQL 8.0.4.

validate_password.dictionary_file: validate_password dictionary file. Added in MySQL 8.0.4.

validate_password.dictionary_file_last_parsed: When the dictionary file was last parsed. Added in MySQL 8.0.4.

validate_password.dictionary_file_words_count: Number of words in dictionary file. Added in MySQL 8.0.4.

validate_password.length: validate_password required password length. Added in MySQL 8.0.4.

validate_password.mixed_case_count: validate_password required number of uppercase/lowercase characters. Added in MySQL 8.0.4.

validate_password.number_count: validate_password required number of digit characters. Added in MySQL 8.0.4.

validate_password.policy: validate_password password policy. Added in MySQL 8.0.4.

validate_password.special_char_count: validate_password required number of special characters. Added in MySQL 8.0.4.

version_compile_zlib: Version of compiled-in zlib library. Added in MySQL 8.0.11.

windowing_use_high_precision: Whether to compute window functions to high precision. Added in MySQL 8.0.2.

Compression: Whether the client connection uses compression in the client/server protocol. Deprecated as of MySQL 8.0.18.

expire_logs_days: Purge binary logs after this many days. Deprecated as of MySQL 8.0.3.

innodb_undo_tablespaces: Number of tablespace files that rollback segments are divided between. Deprecated as of MySQL 8.0.4.

log_bin_use_v1_row_events: Whether server is using version 1 binary log row events. Deprecated as of MySQL 8.0.18.

log_syslog: Whether to write error log to syslog. Deprecated as of MySQL 8.0.2.

master-info-file: The location and name of the file that remembers the master and where the I/O replication thread is in the master's binary logs. Deprecated as of MySQL 8.0.18.

max_length_for_sort_data: Max number of bytes in sorted records. Deprecated as of MySQL 8.0.20.

no-dd-upgrade: Prevent automatic upgrade of data dictionary tables at startup. Deprecated as of MySQL 8.0.16.

relay_log_info_file: File in which the slave records information about the relay logs. Deprecated as of MySQL 8.0.18.

slave_compressed_protocol: Use compression of master/slave protocol. Deprecated as of MySQL 8.0.18.

slave_rows_search_algorithms: Determines search algorithms used for slave update batching. Any 2 or 3 from the list INDEX_SEARCH, TABLE_SCAN, HASH_SCAN. Deprecated as of MySQL 8.0.18.

symbolic-links: Permit symbolic links for MyISAM tables. Deprecated as of MySQL 8.0.2.

Com_alter_db_upgrade: Count of ALTER DATABASE ... UPGRADE DATA DIRECTORY NAME statements. Removed in MySQL 8.0.0.

Innodb_available_undo_logs: Display the total number of InnoDB rollback segments; different from innodb_rollback_segments, which displays the number of active rollback segments. Removed in MySQL 8.0.2.

Qcache_free_blocks: Number of free memory blocks in the query cache. Removed in MySQL 8.0.3.

Qcache_free_memory: The amount of free memory for the query cache. Removed in MySQL 8.0.3.

Qcache_hits: Number of query cache hits. Removed in MySQL 8.0.3.

Qcache_inserts: Number of query cache inserts. Removed in MySQL 8.0.3.

Qcache_lowmem_prunes: Number of queries that were deleted from the query cache due to lack of free memory in the cache. Removed in MySQL 8.0.3.

Qcache_not_cached: Number of noncached queries (not cacheable, or not cached due to the query_cache_type setting). Removed in MySQL 8.0.3.

Qcache_queries_in_cache: Number of queries registered in the query cache. Removed in MySQL 8.0.3.

Qcache_total_blocks: The total number of blocks in the query cache. Removed in MySQL 8.0.3.

Slave_heartbeat_period: The slave's replication heartbeat interval, in seconds. Removed in MySQL 8.0.1.

Slave_last_heartbeat: Shows when the latest heartbeat signal was received, in TIMESTAMP format. Removed in MySQL 8.0.1.

Slave_received_heartbeats: Number of heartbeats received by a replication slave since previous reset. Removed in MySQL 8.0.1.

Slave_retried_transactions: The total number of times since startup that the replication slave SQL thread has retried transactions. Removed in MySQL 8.0.1.

Slave_running: The state of this server as a replication slave (slave I/O thread status). Removed in MySQL 8.0.1.

bootstrap: Used by mysql installation scripts. Removed in MySQL 8.0.0.

date_format: The DATE format (unused). Removed in MySQL 8.0.3.

datetime_format: The DATETIME/TIMESTAMP format (unused). Removed in MySQL 8.0.3.

des-key-file: Load keys for des_encrypt() and des_encrypt from given file. Removed in MySQL 8.0.3.

group_replication_allow_local_disjoint_gtids_join: Allow the current server to join the group even if it has transactions not present in the group. Removed in MySQL 8.0.4.

have_crypt: Availability of the crypt() system call. Removed in MySQL 8.0.3.

ignore-db-dir: Treat directory as nondatabase directory. Removed in MySQL 8.0.0.

ignore_builtin_innodb: Ignore the built-in InnoDB. Removed in MySQL 8.0.3.

ignore_db_dirs: Directories treated as nondatabase directories. Removed in MySQL 8.0.0.

innodb_checksums: Enable InnoDB checksums validation. Removed in MySQL 8.0.0.

innodb_disable_resize_buffer_pool_debug: Disables resizing of the InnoDB buffer pool. Removed in MySQL 8.0.0.

innodb_file_format: The format for new InnoDB tables. Removed in MySQL 8.0.0.

innodb_file_format_check: Whether InnoDB performs file format compatibility checking. Removed in MySQL 8.0.0.

innodb_file_format_max: The file format tag in the shared tablespace. Removed in MySQL 8.0.0.

innodb_large_prefix: Enables longer keys for column prefix indexes. Removed in MySQL 8.0.0.

innodb_locks_unsafe_for_binlog: Force InnoDB not to use next-key locking. Instead use only row-level locking. Removed in MySQL 8.0.0.

innodb_scan_directories: Defines directories to scan for tablespace files during InnoDB recovery. Removed in MySQL 8.0.4.

innodb_stats_sample_pages: Number of index pages to sample for index distribution statistics. Removed in MySQL 8.0.0.

innodb_support_xa: Enable InnoDB support for the XA two-phase commit. Removed in MySQL 8.0.0.

innodb_undo_logs: Defines the number of undo logs (rollback segments) used by InnoDB; an alias for innodb_rollback_segments. Removed in MySQL 8.0.2.

internal_tmp_disk_storage_engine: Storage engine for internal temporary tables. Removed in MySQL 8.0.16.

log-warnings: Log some noncritical warnings to the log file. Removed in MySQL 8.0.3.

log_builtin_as_identified_by_password: Whether to log CREATE/ALTER USER, GRANT in backward-compatible fashion. Removed in MySQL 8.0.11.

log_error_filter_rules: Filter rules for error logging. Removed in MySQL 8.0.4.

log_syslog: Whether to write error log to syslog. Removed in MySQL 8.0.13.

log_syslog_facility: Facility for syslog messages. Removed in MySQL 8.0.13.

log_syslog_include_pid: Whether to include server PID in syslog messages. Removed in MySQL 8.0.13.

log_syslog_tag: Tag for server identifier in syslog messages. Removed in MySQL 8.0.13.

max_tmp_tables: Unused. Removed in MySQL 8.0.3.

metadata_locks_cache_size: Size of the metadata locks cache. Removed in MySQL 8.0.13.

metadata_locks_hash_instances: Number of metadata lock hashes. Removed in MySQL 8.0.13.

multi_range_count: The maximum number of ranges to send to a table handler at once during range selects. Removed in MySQL 8.0.3.

old_passwords: Selects password hashing method for PASSWORD(). Removed in MySQL 8.0.11.

partition: Enable (or disable) partitioning support. Removed in MySQL 8.0.0.

query_cache_limit: Do not cache results that are bigger than this. Removed in MySQL 8.0.3.

query_cache_min_res_unit: Minimal size of unit in which space for results is allocated (last unit will be trimmed after writing all result data). Removed in MySQL 8.0.3.

query_cache_size: The memory allocated to store results from old queries. Removed in MySQL 8.0.3.

query_cache_type: Query cache type. Removed in MySQL 8.0.3.

query_cache_wlock_invalidate: Invalidate queries in query cache on LOCK for write. Removed in MySQL 8.0.3.

secure_auth: Disallow authentication for accounts that have old (pre-4.1) passwords. Removed in MySQL 8.0.3.

show_compatibility_56: Compatibility for SHOW STATUS/VARIABLES. Removed in MySQL 8.0.1.

skip-partition: Do not enable user-defined partitioning. Removed in MySQL 8.0.0.

sync_frm: Sync .frm to disk on create. Enabled by default. Removed in MySQL 8.0.0.

temp-pool: Using this option will cause most temporary files created to use a small set of names, rather than a unique name for each new file. Removed in MySQL 8.0.1.

time_format: The TIME format (unused). Removed in MySQL 8.0.3.

tx_isolation: The default transaction isolation level. Removed in MySQL 8.0.3.

tx_read_only: Default transaction access mode. Removed in MySQL 8.0.3.