DROP USER (and RENAME USER) in MariaDB

Last updated: 2026-07-20

This skill covers the MariaDB-specific behavior of DROP USER and, briefly, the related RENAME USER statement. It assumes the agent already knows the standard-SQL notion of dropping/renaming a database principal. The traps here are almost all about what DROP USER doesn't do — it does not touch active sessions, owned objects, or privileges the dropped user granted to others.

Default context: Assume MariaDB 11.8 LTS (GA May 2025) unless the user states another version. Only newer-than-10.6 features carry a *(since X.Y)* annotation.

What LLMs Often Miss

If the agent writes / suggests…	…prefer the MariaDB form
Assuming DROP USER kills the user's open connections	It does not. A dropped account with an active session keeps working, with all its privileges, until that connection disconnects — MariaDB only blocks new connections and emits a note-level warning: Dropped users '...' have active connections. Use KILL CONNECTION if they should not be used anymore. To actually cut it off, run KILL CONNECTION <id> for each of the account's live sessions
Writing a loop issuing one DROP USER per account	DROP USER takes a comma-separated list in a single statement: DROP USER 'u1'@'%', 'u2'@'%', 'u3'@'%'; — one statement, one binlog event, one round trip
DROP USER 'bob'@'%'; in a script where the account might not exist	Add IF EXISTS — without it, a missing account raises ERROR 1396 (HY000): Operation DROP USER failed for '...'. With IF EXISTS, a missing account produces a note, not an error, so idempotent teardown scripts don't fail
Expecting a dropped user's tables/views/procedures to disappear too	DROP USER never cascades onto objects the user owns — those objects are untouched and now ownerless. It only removes rows from the grant tables (mysql.user, mysql.db, mysql.tables_priv, etc.)
Expecting revocation of privileges the dropped user had granted to other users	Not revoked. If alice ran GRANT SELECT ON t TO bob, dropping alice leaves bob's SELECT on t intact — there is no cascade on grants made by the account
Dropping a user that's the DEFINER of a view, stored routine, or trigger	The object is left behind with a now-nonexistent definer. It keeps working for SELECT/schema purposes in most cases, but invoking it (routine call, SQL SECURITY DEFINER context, etc.) fails with The user specified as a definer ('user'@'host') does not exist. Re-point the DEFINER (e.g. ALTER VIEW ... DEFINER = ...) before dropping the account, not after
Renaming a user and assuming privileges need to be re-granted	RENAME USER old TO new preserves the account's existing privileges — they follow the renamed account; no re-GRANT needed
Checking for active connections before RENAME USER	Not necessary and not done by the server — RENAME USER, unlike DROP USER, does not check for or warn about active sessions of the account being renamed

DROP USER — Syntax and Behavior

DROP USER [IF EXISTS] user_name [, user_name] ...

• A connected account is still deleted from the grant tables, but a note-level warning is issued and the live session keeps its privileges until it disconnects on its own. Run KILL CONNECTION <id> against each of the account's sessions if you need to end them immediately.
• In sql_mode=ORACLE, dropping a currently-connected user fails outright with Operation DROP USER failed for '...', instead of the warn-and-proceed behavior used in the default mode.
• Each user_name uses the same 'user'@'host' form as CREATE USER; a bare user name implies @'%'.
• Multiple accounts in one statement are processed together: if some fail (don't exist, and IF EXISTS wasn't given) while others succeed, the successful drops still commit, and a single ERROR 1396 lists all the failed names together.
• Privilege required: the global CREATE USER privilege, or the DELETE privilege on the mysql database.

-- Idempotent teardown:
DROP USER IF EXISTS 'svc_batch'@'%', 'svc_report'@'%';

RENAME USER

RENAME USER old_user TO new_user [, old_user TO new_user] ...

• Renames one or more accounts in place; privileges are attached to the same underlying account record, so they carry over to the new name automatically.
• If any old_user doesn't exist, or any new_user already exists, ERROR 1396 (HY000) results — same partial-success semantics as DROP USER: pairs that don't error still get renamed.
• Also usable to change just the host part: RENAME USER 'foo'@'1.2.3.4' TO 'foo'@'10.20.30.40';
• Privilege required: the global CREATE USER privilege, or the UPDATE privilege on the mysql database.
• For changing other account attributes (password, REQUIRE, resource limits) without changing the name, use ALTER USER, not RENAME USER.

See Also

• mariadb-create-user — account creation, IDENTIFIED BY/auth plugins, resource limits
• mariadb-grant — privilege levels, GRANT ... TO, CREATE USER vs. DELETE/UPDATE on mysql
• Canonical references on mariadb.com/docs:
  • https://mariadb.com/docs/server/reference/sql-statements/account-management-sql-statements/drop-user
  • https://mariadb.com/docs/server/reference/sql-statements/account-management-sql-statements/rename-user
  • https://mariadb.com/docs/server/reference/sql-statements/account-management-sql-statements/create-user
  • https://mariadb.com/docs/server/reference/sql-statements/account-management-sql-statements/grant

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