1. Database Reference
  2. Static Data Dictionary Views
  3. Static Data Dictionary Views: ALL_PART_COL_STATISTICS to DATABASE_PROPERTIES
  4. ALL_PART_COL_STATISTICS

3.1 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)

GLOBAL_STATS will be YES if statistics have been gathered or NO if statistics have been aggregated from subpartitions or have not been gathered

USER_STATS

VARCHAR2(3)

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

NOTES

VARCHAR2(63)

Describes some additional properties of the statistics. Possible values include:

  • INCREMENTAL: Indicates that the column has synopses.

  • INCREMENTAL(HLL): Indicates that the column has synopses, and that the synopses are in the hyperloglog format introduced in Oracle Database 12c Release 2 (12.2.0.1).

  • INCREMENTAL(SAMPLING): Indicates that the column has synopses, and that the synopses are in the adaptive sampling format introduced in Oracle Database 11g Release 1 (11.1).

This column can be used to determine whether synopses in the adaptive sampling format have been phased out entirely and purged properly.

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: