SHOW TABLE DISTRIBUTION 从 v9.0.0 开始引入
SHOW TABLE DISTRIBUTION 语句用于显示指定表的 Region 分布情况。
语法图
- ShowTableDistributionStmt
- TableName
ShowTableDistributionStmt ::=
"SHOW" "TABLE" TableName "DISTRIBUTIONS"
TableName ::=
(SchemaName ".")? Identifier
示例
显示当前表 t1 的 Region 分布情况：
CREATE TABLE `t` (
`a` int DEFAULT NULL,
`b` int DEFAULT NULL,
KEY `idx` (`b`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
PARTITION BY RANGE (`a`)
(PARTITION `p1` VALUES LESS THAN (10000),
PARTITION `p2` VALUES LESS THAN (MAXVALUE)) |
SHOW TABLE t1 DISTRIBUTIONS;
+----------------+----------+------------+---------------------+-------------------+--------------------+-------------------+--------------------+--------------------------+-------------------------+--------------------------+------------------------+-----------------------+------------------------+
| PARTITION_NAME | STORE_ID | STORE_TYPE | REGION_LEADER_COUNT | REGION_PEER_COUNT | REGION_WRITE_BYTES | REGION_WRITE_KEYS | REGION_WRITE_QUERY | REGION_LEADER_READ_BYTES | REGION_LEADER_READ_KEYS | REGION_LEADER_READ_QUERY | REGION_PEER_READ_BYTES | REGION_PEER_READ_KEYS | REGION_PEER_READ_QUERY |
+----------------+----------+------------+---------------------+-------------------+--------------------+-------------------+--------------------+--------------------------+-------------------------+--------------------------+------------------------+-----------------------+------------------------+
| p1 | 1 | tikv | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p1 | 15 | tikv | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p1 | 4 | tikv | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p1 | 5 | tikv | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p1 | 6 | tikv | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p2 | 1 | tikv | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p2 | 15 | tikv | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p2 | 4 | tikv | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p2 | 5 | tikv | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| p2 | 6 | tikv | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
+----------------+----------+------------+---------------------+-------------------+--------------------+-------------------+--------------------+--------------------------+-------------------------+--------------------------+------------------------+-----------------------+------------------------+
MySQL 兼容性
该语句是 TiDB 对 MySQL 语法的扩展。