Server System Variables Type Boolean Default Value OFF Some authentication plugins implement proxy user mapping for themselves (for example, the PAM and Windows authentication plugins). Other authentication plugins do not support proxy users by default. Of these, some can request that the MySQL server itself map proxy users according to granted proxy privileges:  mysql_native_password ,  sha256_password . If the  check_proxy_users  system variable is enabled, the server performs proxy user mapping for any authentication plugins that make such a request. However, it may also be necessary to enable plugin- specific system variables to take advantage of server proxy user mapping support: •For the  mysql_native_password  plugin, enable  mysql_native_password_proxy_users . •For the  sha256_password  plugin, enable  sha256_password_proxy_users . For information about user proxying, see Section 6.2.18, “Proxy Users” . • collation_connection • collation_database System Variable collation_connection Scope Global, Session Dynamic Yes SET_VAR  Hint Applies No Type String The collation of the connection character set.  collation_connection  is important for comparisons of literal strings. For comparisons of strings with column values,  collation_connection  does not matter because columns have their own collation, which has a higher collation precedence (see Section 10.8.4, “Collation Coercibility in Expressions” ). System Variable collation_database Scope Global, Session Dynamic Yes SET_VAR  Hint Applies No Type String Default Value utf8mb4_0900_ai_ci 781