RENAME INDEX
The statement ALTER TABLE .. RENAME INDEX renames an existing index to a new name. This operation is instant in TiDB, and requires only a meta data change.
Synopsis
- AlterTableStmt
- RenameIndexSpec
AlterTableStmt
::= 'ALTER' 'IGNORE'? 'TABLE' TableName RenameIndexSpec ( ',' RenameIndexSpec )*
RenameIndexSpec
::= 'RENAME' ( 'KEY' | 'INDEX' ) Identifier 'TO' Identifier
Examples
mysql> CREATE TABLE t1 (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, c1 INT NOT NULL, INDEX col1 (c1));
Query OK, 0 rows affected (0.11 sec)
mysql> SHOW CREATE TABLE t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`c1` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `col1` (`c1`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
1 row in set (0.00 sec)
mysql> ALTER TABLE t1 RENAME INDEX col1 TO c1;
Query OK, 0 rows affected (0.09 sec)
mysql> SHOW CREATE TABLE t1\G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`c1` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `c1` (`c1`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
1 row in set (0.00 sec)
MySQL compatibility
This statement is understood to be fully compatible with MySQL. Any compatibility differences should be reported via an issue on GitHub.