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

4.105 ALL_TAB_COL_STATISTICS

ALL_TAB_COL_STATISTICS displays column statistics and histogram information extracted from ALL_TAB_COLUMNS.

Related Views

  • DBA_TAB_COL_STATISTICS displays such information extracted from "DBA_TAB_COLUMNS".

  • USER_TAB_COL_STATISTICS displays such information extracted from "USER_TAB_COLUMNS". This view does not display the OWNER column.

Column Datatype NULL Description

OWNER

VARCHAR2(128)

Owner of the table

TABLE_NAME

VARCHAR2(128)

Name of the table

COLUMN_NAME

VARCHAR2(128)

Column name

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

LAST_ANALYZED

DATE

Date on which this column was most recently analyzed

SAMPLE_SIZE

NUMBER

Sample size used in analyzing this column

GLOBAL_STATS

VARCHAR2(3)

GLOBAL_STATS will be YES if statistics are gathered or incrementally maintained, otherwise it will be NO

USER_STATS

VARCHAR2(3)

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

NOTES

VARCHAR2(99)

Describes some additional properties of the statistics. For example:

  • A value of INCREMENTAL indicates that the global statistics are derived from synopses, that is, the global statistics are incrementally maintained.

  • A value of STATS_ON_CONVENTIONAL_LOAD indicates that the statistics are obtained by online statistics gathering for conventional DML.

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

SCOPE

VARCHAR2(7)

The value is SHARED for statistics gathered on any table other than global temporary tables.

For a global tempoary table, the possible values are:

  • SESSION - Indicates that the statistics are session-specific

  • SHARED - Indicates that the statistics are shared across all sessions

See Oracle Database PL/SQL Packages and Types Reference for information about using the GLOBAL_TEMP_TABLE_STATS preference of the DBMS_STATS package to control whether to gather session or shared statistics for global temporary tables.

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