CREATE PLACEMENT POLICY
CREATE PLACEMENT POLICY 用于创建命名的放置策略，随后可以将该策略分配给表、分区或数据库。
语法图
- CreatePolicyStmt
- PolicyName
- PlacementOptionList
- PlacementOption
- CommonPlacementOption
- SugarPlacementOption
- AdvancedPlacementOption
示例
注意
如要查看所在集群中可用的区域，见
SHOW PLACEMENT LABELS。如果未看到任何可用的区域，此 TiKV 集群在部署时可能未正确设置标签 (label)。
CREATE PLACEMENT POLICY p1 PRIMARY_REGION="us-east-1" REGIONS="us-east-1,us-west-1" FOLLOWERS=4;
CREATE TABLE t1 (a INT) PLACEMENT POLICY=p1;
SHOW CREATE PLACEMENT POLICY p1;Query OK, 0 rows affected (0.08 sec)
Query OK, 0 rows affected (0.10 sec)
+--------+---------------------------------------------------------------------------------------------------+
| Policy | Create Policy |
+--------+---------------------------------------------------------------------------------------------------+
| p1 | CREATE PLACEMENT POLICY `p1` PRIMARY_REGION="us-east-1" REGIONS="us-east-1,us-west-1" FOLLOWERS=4 |
+--------+---------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)MySQL 兼容性
该语句是 TiDB 对 MySQL 语法的扩展。