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ALTER USER

This statement changes an existing user inside the TiDB privilege system. In the MySQL privilege system, a user is the combination of a username and the host from which they are connecting from. Thus, it is possible to create a user 'newuser2'@'192.168.1.1' who is only able to connect from the IP address 192.168.1.1. It is also possible to have two users have the same user-portion, and different permissions as they login from different hosts.

Synopsis

AlterUserStmt
ALTERUSERIfExistsUserSpecListRequireClauseOptConnectionOptionsPasswordOrLockOptionsUSER()IDENTIFIEDBYAuthString
UserSpecList
UserSpec,
UserSpec
UsernameAuthOption

Examples

mysql> CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword'; Query OK, 1 row affected (0.01 sec) mysql> SELECT USER, HOST, PASSWORD FROM mysql.`user` WHERE USER = 'newuser'; +---------+------+-------------------------------------------+ | USER | HOST | PASSWORD | +---------+------+-------------------------------------------+ | newuser | % | *5806E04BBEE79E1899964C6A04D68BCA69B1A879 | +---------+------+-------------------------------------------+ 1 row in set (0.00 sec) mysql> ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword'; Query OK, 0 rows affected (0.02 sec) mysql> SELECT USER, HOST, PASSWORD FROM mysql.`user` WHERE USER = 'newuser'; +---------+------+-------------------------------------------+ | USER | HOST | PASSWORD | +---------+------+-------------------------------------------+ | newuser | % | *FB8A1EA1353E8775CA836233E367FBDFCB37BE73 | +---------+------+-------------------------------------------+ 1 row in set (0.00 sec)

MySQL compatibility

  • In MySQL this statement is used to change attributes such as to expire a password. This functionality is not yet supported by TiDB.

See also

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