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