STATEMENT_ID |
VARCHAR2(30) |
|
Optional statement identifier specified in the EXPLAIN PLAN statement |
TIMESTAMP |
DATE |
|
Date and time when the EXPLAIN PLAN statement was issued |
REMARKS |
VARCHAR2(80) |
|
Place for comments that can be added to the steps of the execution plan |
OPERATION |
VARCHAR2(30) |
|
Name of the operation performed at this step |
OPTIONS |
VARCHAR2(255) |
|
Options used for the operation performed at this step; the string returned by the index cost function |
OBJECT_NODE |
VARCHAR2(128) |
|
Name of the database link used to reference the object |
OBJECT_OWNER |
VARCHAR2(30) |
|
Owner of the object |
OBJECT_NAME |
VARCHAR2(30) |
|
Name of the object |
OBJECT_INSTANCE |
NUMBER(38) |
|
Numbered position of the object name in the original SQL statement |
OBJECT_TYPE |
VARCHAR2(30) |
|
Descriptive modifier that further describes the type of object |
OPTIMIZER |
VARCHAR2(255) |
|
Current mode of the optimizer |
SEARCH_COLUMNS |
NUMBER |
|
Number of index columns with start and stop keys (that is, the number of columns with matching predicates) |
ID |
NUMBER(38) |
|
Identification number for this step in the execution plan |
PARENT_ID |
NUMBER(38) |
|
ID of the next step that operates on the results of this step |
POSITION |
NUMBER(38) |
|
Order of processing for steps with the same parent ID. For cost-based optimization, the value in the first row of the plan is the statement's execution cost. For rule-based optimization, the value is null in the first row. |
COST |
NUMBER(38) |
|
Cost of the current operation estimated by the cost-based optimizer (CBO) |
CARDINALITY |
NUMBER(38) |
|
Number of rows returned by the current operation (estimated by the CBO) |
BYTES |
NUMBER(38) |
|
Number of bytes returned by the current operation |
OTHER_TAG |
VARCHAR2(255) |
|
Describes the function of the SQL text in the OTHER column. Values for OTHER_TAG are:
-
SERIAL - SQL is the text of a locally-executed, serial query plan. Currently, SQL is not loaded in OTHER for this case.
-
SERIAL_FROM_REMOTE - SQL text shown in the OTHER column will be executed at a remote site
-
PARALLEL_COMBINED_WITH_PARENT - Parent of this operation is a DFO that performs both operations in the parallel execution plan
-
PARALLEL_COMBINED_WITH_CHILD - Child of this operation is a DFO that performs both operations in the parallel execution plan.
-
PARALLEL_TO_SERIAL - SQL text shown in the OTHER column is the top-level of the parallel plan.
-
PARALLEL_TO_PARALLEL - SQL text shown in the OTHER column is executed and output in parallel
-
PARALLEL_FROM_SERIAL - Operation consumes data from a serial operation and outputs it in parallel
|
PARTITION_START |
VARCHAR2(255) |
|
Start partition of a range of accessed partitions |
PARTITION_STOP |
VARCHAR2(255) |
|
Stop partition of a range of accessed partitions |
PARTITION_ID |
NUMBER(38) |
|
Step that has computed the pair of values of the PARTITION_START and PARTITION_STOP columns |
OTHER |
LONG |
|
Information about parallel execution slaves and parallel queries |
DISTRIBUTION |
VARCHAR2(30) |
|
Distribution method |
CPU_COST |
NUMBER(38) |
|
User-defined CPU cost |
IO_COST |
NUMBER(38) |
|
User-defined I/O cost |
TEMP_SPACE |
NUMBER(38) |
|
Temporary space usage of the operation (sort or hash-join) as estimated by the optimizer's cost-based approach. For statements that use the rule-based approach, this column is null. |
ACCESS_PREDICATES |
VARCHAR2(4000) |
|
Predicates used to locate rows in an access structure. For example, start or stop predicates for an index range scan. |
FILTER_PREDICATES |
VARCHAR2(4000) |
|
Predicates used to filter rows before producing them |
PROJECTION |
VARCHAR2(4000) |
|
Expressions produced by the operation |
TIME |
NUMBER(38) |
|
Elapsed time (in seconds) of the operation as estimated by the optimizer's cost-based approach. For statements that use the rule-based approach, this column is null. |
