Note
This view is available starting with V3.2.1.
Purpose
This view displays the column statistics and histogram information of the partitions in the partitioned tables of the current user.
Applicability
This view is available only in Oracle mode.
Columns
Column |
Type |
Nullable |
Description |
|---|---|---|---|
| TABLE_NAME | VARCHAR2(128) | NO | The name of the table. |
| PARTITION_NAME | VARCHAR2(128) | NO | The name of the partition. |
| COLUMN_NAME | VARCHAR2(128) | NO | The name of the column. |
| NUM_DISTINCT | NUMBER | YES | The number of distinct values in the column. |
| LOW_VALUE | VARCHAR2(128) | YES | The minimum value of the column. |
| HIGH_VALUE | VARCHAR2(128) | YES | The maximum value of the column. |
| DENSITY | NUMBER | YES | The density of the column. |
| NUM_NULLS | NUMBER | YES | The number of NULL values in the column. |
| NUM_BUCKETS | NUMBER | YES | The number of buckets in the histogram of the column. |
| SAMPLE_SIZE | NUMBER | YES | The sampling size used for analysis. |
| LAST_ANALYZED | DATE | YES | The time when the last analysis was performed. |
| GLOBAL_STATS | VARCHAR2(3) | YES |
|
| USER_STATS | VARCHAR2(3) | YES | Indicates whether the partition statistics are user-defined. |
| NOTES | VARCHAR2(80) | YES | Records additional attributes. |
| AVG_COL_LEN | NUMBER | YES | The average length of the column. |
| HISTOGRAM | VARCHAR2(15) | YES | The type of the histogram. |
Sample query
Query the column statistics and histogram information of the partitions of the T_SUBPART table in the partitioned tables of the current user.
obclient [SYS]> SELECT * FROM SYS.USER_PART_COL_STATISTICS WHERE TABLE_NAME='T_SUBPART';
The query result is as follows:
+------------+----------------+-------------+--------------+-----------+------------+-----------------------+-----------+-------------+-------------+---------------+--------------+------------+-------+-------------+-----------+
| TABLE_NAME | PARTITION_NAME | COLUMN_NAME | NUM_DISTINCT | LOW_VALUE | HIGH_VALUE | DENSITY | NUM_NULLS | NUM_BUCKETS | SAMPLE_SIZE | LAST_ANALYZED | GLOBAL_STATS | USER_STATS | NOTES | AVG_COL_LEN | HISTOGRAM |
+------------+----------------+-------------+--------------+-----------+------------+-----------------------+-----------+-------------+-------------+---------------+--------------+------------+-------+-------------+-----------+
| T_SUBPART | P2 | C1 | 2658 | 3 | 9995 | .00037622272385252068 | 0 | 5 | 2504 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1 | C1 | 4986 | 0 | 9999 | .00020056157240272763 | 0 | 5 | 4966 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0 | C1 | 2646 | 2 | 9998 | .0003779289493575208 | 0 | 5 | 2530 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2 | C2 | 965 | 1 | 999 | .0010362694300518134 | 0 | 5 | 2504 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1 | C2 | 1031 | 0 | 999 | .00096993210475266732 | 0 | 5 | 4966 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0 | C2 | 975 | 0 | 999 | .0010256410256410256 | 0 | 5 | 2530 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2 | C3 | 1498 | 1 | 1999 | .00066755674232309744 | 0 | 5 | 2504 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1 | C3 | 1933 | 0 | 1999 | .00051733057423693739 | 0 | 5 | 4966 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0 | C3 | 1529 | 0 | 1999 | .00065402223675604975 | 0 | 5 | 2530 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
+------------+----------------+-------------+--------------+-----------+------------+-----------------------+-----------+-------------+-------------+---------------+--------------+------------+-------+-------------+-----------+
9 rows in set
References
To query the column statistics of partitions in all partitioned tables accessible to the current user, see ALL_PART_COL_STATISTICS.
To query the column statistics of partitions in all partitioned tables in the current tenant, see DBA_PART_COL_STATISTICS.
To query the column statistics of tables, see the following views:
To query the column statistics of global tables, see the following views:
To query the column statistics of subpartitions, see the following views:
To query the histogram statistics of tables, see the following views:
To query the histogram statistics of partitions, see the following views:
To query the histogram statistics of subpartitions, see the following views:
To query the index statistics, see the following views:
For more information about how to collect statistics, see the following topics: