Note
This view is available starting with V3.2.1.
Purpose
This view displays the column statistics and histogram information of subpartitions in the partitioned tables of the current user.
Applicability
This view is available starting with OceanBase Database in Oracle mode.
Columns
| Column | Type | Nullable | Description |
|---|---|---|---|
| TABLE_NAME | VARCHAR2(128) | NO | The name of the table. |
| SUBPARTITION_NAME | VARCHAR2(128) | NO | The name of the subpartition. |
| 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 column histogram. |
| SAMPLE_SIZE | NUMBER | YES | The sample size used for analysis. |
| LAST_ANALYZED | DATE | YES | The date and 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 | Additional attributes. |
| AVG_COL_LEN | NUMBER | YES | The average length of the column. |
| HISTOGRAM | VARCHAR2(15) | YES | The histogram type. |
Sample query
Query the column statistics of subpartitions in the partitioned table T_SUBPART of the current user.
obclient [SYS]> SELECT * FROM SYS.USER_SUBPART_COL_STATISTICS WHERE TABLE_NAME='T_SUBPART';
The query result is as follows:
+------------+-------------------+-------------+--------------+-----------+------------+-----------------------+-----------+-------------+-------------+---------------+--------------+------------+-------+-------------+-----------+
| TABLE_NAME | SUBPARTITION_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 | P0SSP0 | C3 | 434 | 2 | 1999 | .002304147465437788 | 0 | 5 | 829 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP0 | C2 | 248 | 2 | 999 | .0040322580645161289 | 0 | 5 | 829 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP0 | C1 | 844 | 2 | 9990 | .0011848341232227489 | 0 | 5 | 829 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP1 | C3 | 723 | 0 | 1998 | .0013831258644536654 | 0 | 5 | 1141 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP1 | C2 | 482 | 0 | 998 | .0020746887966804979 | 0 | 5 | 1141 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP1 | C1 | 1144 | 1000 | 9998 | .00087412587412587413 | 0 | 5 | 1141 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP2 | C3 | 372 | 3 | 1991 | .0026881720430107529 | 0 | 5 | 560 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP2 | C2 | 235 | 3 | 992 | .0042553191489361703 | 0 | 5 | 560 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P0SSP2 | C1 | 575 | 1014 | 9986 | .0017391304347826088 | 0 | 5 | 560 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP0 | C3 | 465 | 2 | 1999 | .0021505376344086021 | 0 | 5 | 1122 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP0 | C2 | 248 | 2 | 999 | .0040322580645161289 | 0 | 5 | 1122 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP0 | C1 | 1119 | 1002 | 9999 | .00089365504915102768 | 0 | 5 | 1122 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP1 | C3 | 980 | 0 | 1998 | .0010204081632653062 | 0 | 5 | 2714 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP1 | C2 | 517 | 0 | 998 | .0019342359767891683 | 0 | 5 | 2714 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP1 | C1 | 2804 | 0 | 9997 | .0003566333808844508 | 0 | 5 | 2714 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP2 | C3 | 479 | 3 | 1992 | .0020876826722338203 | 0 | 5 | 1130 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP2 | C2 | 251 | 3 | 992 | .0039840637450199202 | 0 | 5 | 1130 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P1SSP2 | C1 | 1168 | 1005 | 9992 | .00085616438356164379 | 0 | 5 | 1130 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP0 | C3 | 339 | 2 | 1999 | .0029498525073746312 | 0 | 5 | 549 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP0 | C2 | 228 | 2 | 999 | .0043859649122807015 | 0 | 5 | 549 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP0 | C1 | 527 | 1042 | 9963 | .0018975332068311196 | 0 | 5 | 549 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP1 | C3 | 725 | 1 | 1998 | .0013793103448275861 | 0 | 5 | 1125 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP1 | C2 | 473 | 1 | 998 | .0021141649048625794 | 0 | 5 | 1125 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP1 | C1 | 1125 | 1004 | 9995 | .00088888888888888893 | 0 | 5 | 1125 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP2 | C3 | 445 | 3 | 1987 | .0022471910112359553 | 0 | 5 | 830 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP2 | C2 | 251 | 3 | 992 | .0039840637450199202 | 0 | 5 | 830 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
| T_SUBPART | P2SSP2 | C1 | 795 | 3 | 9972 | .0012578616352201257 | 0 | 5 | 830 | 17-MAR-25 | NO | NO | NULL | 20 | HYBRID |
+------------+-------------------+-------------+--------------+-----------+------------+-----------------------+-----------+-------------+-------------+---------------+--------------+------------+-------+-------------+-----------+
27 rows in set
References
To query the column statistics of subpartitions of all partitioned tables accessible to the current user, use the ALL_SUBPART_COL_STATISTICS view.
To query the column statistics of subpartitions of all partitioned tables in the current tenant, use the DBA_SUBPART_COL_STATISTICS view.
To query the column statistics of tables, use the following views:
To query the column statistics of global tables, use the following views:
To query the column statistics of partitioned tables, use the following views:
To query the histogram statistics of tables, use the following views:
To query the histogram statistics of partitioned tables, use the following views:
To query the histogram statistics of subpartitions, use the following views:
To query the index statistics, use the following views:
For information about how to collect statistics, see the following topics: