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oceanbase.DBA_SUBPART_COL_STATISTICS
更新时间：2026-04-01 14:27:05
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说明
该视图从 V4.0.0 版本开始引入。
功能描述
展示本租户所有子分区表的列统计信息和直方图信息。
字段说明
| 字段名称 | 类型 | 是否可以为 NULL | 描述 |
|---|---|---|---|
| OWNER | varchar(128) | NO | 分区表的所有者 |
| TABLE_NAME | varchar(128) | NO | 表名 |
| SUBPARTITION_NAME | varchar(128) | NO | 子分区表名称 |
| COLUMN_NAME | varchar(128) | NO | 列名 |
| NUM_DISTINCT | decimal(10,0) | NO | 列中不同值的数量 |
| LOW_VALUE | varchar(128) | NO | 列的最小值 |
| HIGH_VALUE | varchar(128) | NO | 列的最大值 |
| DENSITY | decimal(10,0) | NO | 列的密度。如果直方图在 COLUMN_NAME 上可用，则此列显示跨越直方图中少于 2 个端点的值的选择性。它不代表跨越 2 个或更多端点的值的选择性。如果直方图在 COLUMN_NAME 上不可用，则此列的值为 1/ NUM_DISTINCT |
| NUM_NULLS | decimal(10,0) | NO | 列中的 NULL 数 |
| NUM_BUCKETS | decimal(10,0) | NO | 列的直方图中的桶数 |
| LAST_ANALYZED | datetime(6) | NO | 最近分析色谱柱的日期 |
| SAMPLE_SIZE | decimal(10,0) | NO | 用于分析色谱柱的样本量 |
| GLOBAL_STATS | varchar(3) | NO | 指示统计信息是否已收集：
|
| USER_STATS | varchar(3) | NO | 指示统计信息是否由用户直接输入：
|
| NOTES | varchar(80) | NO | 描述统计信息的一些附加属性。例如：如果值为 INCREMENTAL，则全局统计信息来自概要，即：全局统计信息是增量维护的 |
| AVG_COL_LEN | decimal(10,0) | NO | 列的平均长度（以字节为单位） |
| HISTOGRAM | varchar(15) | NO | 指示直方图的类型：
|
查询示例
查看本租户的分区表 t_subpart 的二级分区的列统计信息。
obclient [oceanbase]> SELECT * FROM oceanbase.DBA_SUBPART_COL_STATISTICS WHERE TABLE_NAME='t_subpart';
查询结果如下：
+-------+------------+-------------------+-------------+--------------+-----------+------------+--------------+-----------+-------------+----------------------------+-------------+--------------+------------+-------+-------------+-----------+
| OWNER | TABLE_NAME | SUBPARTITION_NAME | COLUMN_NAME | NUM_DISTINCT | LOW_VALUE | HIGH_VALUE | DENSITY | NUM_NULLS | NUM_BUCKETS | LAST_ANALYZED | SAMPLE_SIZE | GLOBAL_STATS | USER_STATS | NOTES | AVG_COL_LEN | HISTOGRAM |
+-------+------------+-------------------+-------------+--------------+-----------+------------+--------------+-----------+-------------+----------------------------+-------------+--------------+------------+-------+-------------+-----------+
| test | t_subpart | p0ssp0 | c1 | 1313 | 0 | 9999 | 0.0007616146 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1336 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp0 | c2 | 332 | 0 | 999 | 0.0030120482 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1336 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp0 | c3 | 630 | 0 | 1999 | 0.0015873016 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1336 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp1 | c1 | 1001 | 2001 | 8997 | 0.0009990010 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp1 | c2 | 349 | 1 | 997 | 0.0028653295 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp1 | c3 | 691 | 1 | 1997 | 0.0014471780 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp2 | c1 | 996 | 1002 | 7998 | 0.0010040161 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp2 | c2 | 338 | 2 | 998 | 0.0029585799 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p0ssp2 | c3 | 678 | 2 | 1998 | 0.0014749263 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp0 | c1 | 1025 | 1000 | 7999 | 0.0009756098 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1002 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp0 | c2 | 332 | 0 | 999 | 0.0030120482 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1002 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp0 | c3 | 630 | 0 | 1999 | 0.0015873016 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1002 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp1 | c1 | 1357 | 1 | 9997 | 0.0007369197 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1332 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp1 | c2 | 349 | 1 | 997 | 0.0028653295 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1332 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp1 | c3 | 691 | 1 | 1997 | 0.0014471780 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1332 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp2 | c1 | 965 | 2002 | 8998 | 0.0010362694 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp2 | c2 | 338 | 2 | 998 | 0.0029585799 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p1ssp2 | c3 | 678 | 2 | 1998 | 0.0014749263 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp0 | c1 | 1007 | 2000 | 8999 | 0.0009930487 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1002 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp0 | c2 | 332 | 0 | 999 | 0.0030120482 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1002 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp0 | c3 | 630 | 0 | 1999 | 0.0015873016 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1002 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp1 | c1 | 1047 | 1001 | 7997 | 0.0009551098 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp1 | c2 | 349 | 1 | 997 | 0.0028653295 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp1 | c3 | 691 | 1 | 1997 | 0.0014471780 | 0 | 5 | 2025-03-17 15:30:30.152256 | 999 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp2 | c1 | 1298 | 2 | 9998 | 0.0007704160 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1332 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp2 | c2 | 338 | 2 | 998 | 0.0029585799 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1332 | NO | NO | NULL | 20 | HYBRID |
| test | t_subpart | p2ssp2 | c3 | 678 | 2 | 1998 | 0.0014749263 | 0 | 5 | 2025-03-17 15:30:30.152256 | 1332 | NO | NO | NULL | 20 | HYBRID |
+-------+------------+-------------------+-------------+--------------+-----------+------------+--------------+-----------+-------------+----------------------------+-------------+--------------+------------+-------+-------------+-----------+
27 rows in set
相关视图或文档
查看表级的列统计信息：DBA_TAB_STATISTICS
查看 Global 级的列统计信息：DBA_TAB_COL_STATISTICS
查看 Partition 级的列统计信息：DBA_PART_COL_STATISTICS
查看表级的直方图统计信息：DBA_TAB_HISTOGRAMS
查看 Partition 级的直方图统计信息：DBA_PART_HISTOGRAMS
查看 Subpartition 级的直方图统计信息：DBA_SUBPART_HISTOGRAMS
查看索引统计信息：DBA_IND_STATISTICS
有关如何收集统计信息，参见以下文档：
