MySQL error 1145 occurs when the user or host part in a GRANT statement exceeds the allowed length or is malformed, preventing privilege assignment.
MySQL Error 1145: ER_GRANT_WRONG_HOST_OR_USER appears when the user@host string in a GRANT statement is longer than MySQL permits or is syntactically invalid. Shorten the user or host identifier, ensure it follows the user@host format, and re-run GRANT to resolve the issue.
The host or user argument to GRANT is too long
MySQL raises error 1145 with the text "The host or user argument to GRANT is too long" when it rejects a GRANT statement. The server validates the user@host string before inserting a row into the mysql.user ACL table.
If either the user name or host name exceeds the internal column length, or the string is malformed, MySQL aborts the statement and returns ER_GRANT_WRONG_HOST_OR_USER.
This error blocks privilege changes, so affected users cannot connect with the intended rights. Fixing it quickly prevents authentication failures and broken automation scripts.
MySQL limits the User column to 32 characters (version 8.0) and the Host column to 255 characters. Earlier versions allow only 16 characters for User.
A GRANT statement that specifies a longer identifier triggers the error immediately.
Malformed syntax such as missing the at-sign (@), double at-signs, or wildcards placed incorrectly also cause MySQL to interpret the identifier length incorrectly and raise the same error.
The fastest fix is to shorten the user name or host pattern so it fits within MySQL's length limits. Verify the string with SELECT LENGTH('name') to confirm the final character count.
Always include the @ separator between user and host.
If you need longer identifiers, upgrade to a newer MySQL version that supports 32-character user names, or redesign the naming scheme to store descriptive details elsewhere, such as in roles or metadata tables.
Automation scripts that derive user names from email addresses often hit the 32-character limit.
Truncate or hash the part before the @ to stay within bounds.
In container orchestration, dynamically generated host names may exceed 255 characters. Replace the full hostname with a shorter wildcard pattern like '10.0.%' or 'svc.internal'.
Create a naming convention that guarantees user names under 32 characters.
Enforce the rule in CI pipelines or Galaxy's AI copilot linting to catch violations before deployment.
Audit existing users with SELECT User, Host FROM mysql.user ORDER BY LENGTH(User) DESC to spot entries close to the limit and refactor early.
Error 1133 (ER_NONEXISTING_GRANT) arises when you REVOKE privileges from a user that does not exist. Confirm the user@host string before revoking.
Error 1141 (ER_NOT_ALLOWED_COMMAND) occurs when a non-root account issues GRANT.
Switch to a user with the global GRANT OPTION privilege, such as root, to resolve.
.
User identifiers longer than 32 characters (or 16 in older versions) immediately trigger error 1145.
GRANT strings with fully qualified domain names over 255 characters exceed the Host column length and are rejected.
Missing @ symbols, extra wildcards, or empty user portions make MySQL misread the identifier and treat it as overly long.
Scripts written for pre-MySQL 4.1 (16-char user limit) can break when executed on modern servers with different parsing rules.
.
Raised when attempting to revoke privileges from a user@host combination that does not exist. Confirm exact spelling with mysql.user.
Occurs when a user lacking the GRANT OPTION tries to issue GRANT or REVOKE. Use a superuser account.
Appears when you try to create or drop a user that conflicts with an existing ACL entry.
Drop or rename the conflicting user first.
Happens when the connecting host is not listed in mysql.user. Add an entry with proper host wildcards.
.
In MySQL 8.0 and 5.7 the User column supports up to 32 characters. Versions before 5.7.7 allow only 16 characters.
Yes. The entire host string, including percent signs or underscores, counts toward the 255 character limit.
No. The mysql.user table is system-managed and altering it can break authentication. Follow the documented limits instead.
Galaxy's AI copilot validates GRANT statements as you type, warning when user or host identifiers exceed MySQL limits, so errors never reach production.
.avif)
.avif){kind=logo}
