SHOW PLACEMENT FOR
SHOW PLACEMENT FOR summarizes all placement options from direct placement and placement policies, and presents them in the canonical form for a specific table, database schema, or partition.
Synopsis
- ShowStmt
- ShowPlacementTarget
ShowStmt ::=
"PLACEMENT" "FOR" ShowPlacementTarget
ShowPlacementTarget ::=
DatabaseSym DBName
| "TABLE" TableName
| "TABLE" TableName "PARTITION" Identifier
Examples
CREATE PLACEMENT POLICY p1 PRIMARY_REGION="us-east-1" REGIONS="us-east-1,us-west-1" FOLLOWERS=4;
use test;
ALTER DATABASE test PLACEMENT POLICY=p1;
CREATE TABLE t1 (a INT);
CREATE TABLE t2 (a INT) PRIMARY_REGION="us-east-1" REGIONS="us-east-1,us-west-1" FOLLOWERS=4;
SHOW PLACEMENT FOR DATABASE test;
SHOW PLACEMENT FOR TABLE t1;
SHOW CREATE TABLE t1\G
SHOW PLACEMENT FOR TABLE t2;
CREATE TABLE t3 (a INT) PARTITION BY RANGE (a) (PARTITION p1 VALUES LESS THAN (10), PARTITION p2 VALUES LESS THAN (20) FOLLOWERS=4);
SHOW PLACEMENT FOR TABLE t3 PARTITION p1;
SHOW PLACEMENT FOR TABLE t3 PARTITION p2;
Query OK, 0 rows affected (0.02 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.01 sec)
+---------------+----------------------------------------------------------------------+------------------+
| Target | Placement | Scheduling_State |
+---------------+----------------------------------------------------------------------+------------------+
| DATABASE test | PRIMARY_REGION="us-east-1" REGIONS="us-east-1,us-west-1" FOLLOWERS=4 | INPROGRESS |
+---------------+----------------------------------------------------------------------+------------------+
1 row in set (0.00 sec)
+---------------+-------------+------------------+
| Target | Placement | Scheduling_State |
+---------------+-------------+------------------+
| TABLE test.t1 | FOLLOWERS=4 | INPROGRESS |
+---------------+-------------+------------------+
1 row in set (0.00 sec)
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin /*T![placement] PLACEMENT POLICY=`p1` */
1 row in set (0.00 sec)
+---------------+----------------------------------------------------------------------+------------------+
| Target | Placement | Scheduling_State |
+---------------+----------------------------------------------------------------------+------------------+
| TABLE test.t2 | PRIMARY_REGION="us-east-1" REGIONS="us-east-1,us-west-1" FOLLOWERS=4 | INPROGRESS |
+---------------+----------------------------------------------------------------------+------------------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.14 sec)
+----------------------------+-----------------------------------------------------------------------+------------------+
| Target | Placement | Scheduling_State |
+----------------------------+-----------------------------------------------------------------------+------------------+
| TABLE test.t3 PARTITION p1 | PRIMARY_REGION="us-east-1" REGIONS="us-east-1,,us-west-1" FOLLOWERS=4 | INPROGRESS |
+----------------------------+-----------------------------------------------------------------------+------------------+
1 row in set (0.00 sec)
+----------------------------+-------------+------------------+
| Target | Placement | Scheduling_State |
+----------------------------+-------------+------------------+
| TABLE test.t3 PARTITION p2 | FOLLOWERS=4 | INPROGRESS |
+----------------------------+-------------+------------------+
1 row in set (0.00 sec)
MySQL compatibility
This statement is a TiDB extension to MySQL syntax.