Security Compatibility with MySQL

TiDB supports similar security functionality to MySQL 5.7, with the following exceptions:

• Only the mysql_native_password password-based and certificate-based authentication is supported
• External authentication (such as with LDAP) is not currently supported
• Column level permissions are not supported
• Password expiry, as well as password last-changed tracking and password lifetime are not supported #9709
• The permission attributes max_questions, max_updated, max_connections, max_user_connections are not supported
• Password validation is not currently supported #9741