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USER_SUBPART_COL_STATISTICS
更新时间：2026-04-01 14:27:05
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说明
该视图从 V3.2.1 版本开始引入。
功能描述
展示属于当前用户的分区表中二级分区的列统计信息和直方图信息。
功能适用性
该视图仅适用于 OceanBase 数据库 Oracle 模式。
字段说明
| 字段名称 | 类型 | 是否可以为 NULL | 描述 |
|---|---|---|---|
| TABLE_NAME | VARCHAR2(128) | NO | 表名 |
| SUBPARTITION_NAME | VARCHAR2(128) | NO | 二级分区名 |
| COLUMN_NAME | VARCHAR2(128) | NO | 列名 |
| NUM_DISTINCT | NUMBER | YES | 列中不同值的数量 |
| LOW_VALUE | VARCHAR2(128) | YES | 列的最小值 |
| HIGH_VALUE | VARCHAR2(128) | YES | 列的最大值 |
| DENSITY | NUMBER | YES | 列的密度 |
| NUM_NULLS | NUMBER | YES | 列中 NULL 值的数量 |
| NUM_BUCKETS | NUMBER | YES | 列直方图中桶的个数 |
| SAMPLE_SIZE | NUMBER | YES | 分析时的采样大小 |
| LAST_ANALYZED | DATE | YES | 上次分析的时间 |
| GLOBAL_STATS | VARCHAR2(3) | YES |
|
| USER_STATS | VARCHAR2(3) | YES | 表示分区统计信息是否是用户设置的 |
| NOTES | VARCHAR2(80) | YES | 记录一些额外的属性 |
| AVG_COL_LEN | NUMBER | YES | 列的平均长度 |
| HISTOGRAM | VARCHAR2(15) | YES | 直方图类型 |
查询示例
查看当前用户拥有的分区表中，表 T_SUBPART 的二级分区的列统计信息。
obclient [SYS]> SELECT * FROM SYS.USER_SUBPART_COL_STATISTICS WHERE TABLE_NAME='T_SUBPART';
查询结果如下：
+------------+-------------------+-------------+--------------+-----------+------------+-----------------------+-----------+-------------+-------------+---------------+--------------+------------+-------+-------------+-----------+
| 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
相关视图或文档
查看当前用户可访问的分区表的二级分区的列统计信息：ALL_SUBPART_COL_STATISTICS
查看本租户下所有分区表的二级分区的列统计信息：DBA_SUBPART_COL_STATISTICS
表级的列统计信息，查询以下视图：
Global 级的列统计信息，查询以下视图：
Partition 级的列统计信息，查询以下视图：
表级的直方图统计信息，查询以下视图：
Partition 级的直方图统计信息，查询以下视图：
Subpartition 级的直方图统计信息，查询以下视图：
索引统计信息，查询以下视图：
有关如何收集统计信息，参见以下文档：
