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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
ALTERUSERIfExistsUserSpecListRequireClauseOptConnectionOptionsLockOptionAttributeOptionUSER()IDENTIFIEDBYAuthString
UserSpecList
UserSpec,
UserSpec
UsernameAuthOption
Username
StringName@StringNamesingleAtIdentifierCURRENT_USEROptionalBraces
AuthOption
IDENTIFIEDBYAuthStringPASSWORDHashStringWITHStringNameBYAuthStringASHashString
LockOption
ACCOUNTLOCKACCOUNTUNLOCK
AttributeOption
COMMENTCommentStringATTRIBUTEAttributeString

Examples

mysql> CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword'; Query OK, 1 row affected (0.01 sec) mysql> SHOW CREATE USER 'newuser'; +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | CREATE USER for newuser@% | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | CREATE USER 'newuser'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*5806E04BBEE79E1899964C6A04D68BCA69B1A879' REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) mysql> ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword'; Query OK, 0 rows affected (0.02 sec) mysql> SHOW CREATE USER 'newuser'; +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | CREATE USER for newuser@% | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | CREATE USER 'newuser'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*FB8A1EA1353E8775CA836233E367FBDFCB37BE73' REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
ALTER USER 'newuser' ACCOUNT LOCK;
Query OK, 0 rows affected (0.02 sec)

Modify the attributes of newuser:

ALTER USER 'newuser' ATTRIBUTE '{"newAttr": "value", "deprecatedAttr": null}'; SELECT * FROM information_schema.user_attributes;
+-----------+------+--------------------------+ | USER | HOST | ATTRIBUTE | +-----------+------+--------------------------+ | newuser | % | {"newAttr": "value"} | +-----------+------+--------------------------+ 1 rows in set (0.00 sec)

Modify the comment of newuser using ALTER USER ... COMMENT:

ALTER USER 'newuser' COMMENT 'Here is the comment'; SELECT * FROM information_schema.user_attributes;
+-----------+------+--------------------------------------------------------+ | USER | HOST | ATTRIBUTE | +-----------+------+--------------------------------------------------------+ | newuser | % | {"comment": "Here is the comment", "newAttr": "value"} | +-----------+------+--------------------------------------------------------+ 1 rows in set (0.00 sec)

Remove the comment of newuser using ALTER USER ... ATTRIBUTE:

ALTER USER 'newuser' ATTRIBUTE '{"comment": null}'; SELECT * FROM information_schema.user_attributes;
+-----------+------+---------------------------+ | USER | HOST | ATTRIBUTE | +-----------+------+---------------------------+ | newuser | % | {"newAttr": "value"} | +-----------+------+---------------------------+ 1 rows in set (0.00 sec)

See also

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