ALL_PART_COL_STATISTICS

ALL_PART_COL_STATISTICS displays column statistics and histogram information for the table partitions accessible to the current user.

Related Views

  • DBA_PART_COL_STATISTICS displays column statistics and histogram information for all table partitions in the database.

  • USER_PART_COL_STATISTICS displays column statistics and histogram information for the table partitions owned by the current user. This view does not display the OWNER column.

Column Datatype NULL Description

OWNER

VARCHAR2(128)

NOT NULL

Owner of the partitioned table

TABLE_NAME

VARCHAR2(128)

NOT NULL

Name of the table

PARTITION_NAME

VARCHAR2(128)

  

Name of the table partition

COLUMN_NAME

VARCHAR2(4000)

  

Name of the column

NUM_DISTINCT

NUMBER

  

Number of distinct values in the column

LOW_VALUE

RAW(1000)

  

Low value in the column

HIGH_VALUE

RAW(1000)

  

High value in the column

DENSITY

NUMBER

  

If a histogram is available on COLUMN_NAME, then this column displays the selectivity of a value that spans fewer than 2 endpoints in the histogram. It does not represent the selectivity of values that span 2 or more endpoints.

If a histogram is not available on COLUMN_NAME, then the value of this column is 1/NUM_DISTINCT.

NUM_NULLS

NUMBER

  

Number of NULLs in the column

NUM_BUCKETS

NUMBER

  

Number of buckets in histogram for the column

SAMPLE_SIZE

NUMBER

  

Sample size used in analyzing the column

LAST_ANALYZED

DATE

  

Date on which the column was most recently analyzed

GLOBAL_STATS

VARCHAR2(3)

  

Indicates whether statistics were gathered for the partition as a whole (YES) or they were not gathered (NO). Note that partition statistics are estimated from subpartition level statistics when set to NO.

USER_STATS

VARCHAR2(3)

  

Indicates whether statistics were entered directly by the user (YES) or not (NO)

NOTES

VARCHAR2(41)

  

Describes some additional properties of the statistics. For example, if the value is INCREMENTAL, the global statistics are derived from synopses, that is, the global statistics are incrementally maintained.

AVG_COL_LEN

NUMBER

  

Average length of the column (in bytes)

HISTOGRAM

VARCHAR2(15)

  

Indicates existence/type of histogram:

  • NONE

  • FREQUENCY

  • HEIGHT BALANCED

  • HYBRID

  • TOP-FREQUENCY

See Also: