Note
This view is available starting with V3.2.1.
Purpose
This view displays the column statistics and histogram information of subpartitions in 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 histogram of the column. |
| SAMPLE_SIZE | NUMBER | YES | The sampling size during 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 some 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 of subpartitions in the T_SUBPART table 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
View the column statistics of subpartitions for all partitioned tables accessible to the current user: ALL_SUBPART_COL_STATISTICS
View the column statistics of subpartitions for all partitioned tables in the current tenant: DBA_SUBPART_COL_STATISTICS
View the column statistics of tables at the table level by querying the following views:
View the column statistics of tables at the global level by querying the following views:
View the column statistics of tables at the partition level by querying the following views:
View the histogram statistics of tables at the table level by querying the following views:
View the histogram statistics of tables at the partition level by querying the following views:
View the histogram statistics of tables at the subpartition level by querying the following views:
View the index statistics by querying the following views:
For information about how to collect statistics, see the following topics: