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The character set used for returning query results to the client. This includes result data such as column values, result metadata such as column names, and error messages. 

• character_set_server 

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The servers default character set. See Section 10.15, “Character Set Configuration” . If you set this variable, you should also set collation_server  to specify the collation for the character set. 

• character_set_system 

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The character set used by the server for storing identifiers. The value is always utf8 . 

• character_sets_dir 

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The directory where character sets are installed. See Section 10.15, “Character Set Configuration” . 

• check_proxy_users 

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