Описание тега my.cnf
Configuration file for MySQL programs, particularly for the mysqld server.
MySQL programs read one or more option files in .ini format, with sections specific to each program.
The global option file, usually /etc/my.cnf, frequently contains options for the mysqld server and sometimes the mysqldump or isamchk maintenance programs. There are many such options, with complex interactions; fine-tuning them for your specific needs can be out of scope for this site, but ServerFault may be able to help with some general situations.
The user-specific option file, usually ~/.my.cnf, is not often necessary, but can reduce command-line length or help tailor the mysql client to your preferences. For specific advice, SuperUser is probably a better place to look.