Syntax:
FLUSH [NO_WRITE_TO_BINLOG | LOCAL]
    flush_option [, flush_option] ...

The FLUSH statement clears or reloads various internal caches used by
MySQL. To execute FLUSH, you must have the RELOAD privilege.

The RESET statement is similar to FLUSH. See [HELP RESET].

URL: http://dev.mysql.com/doc/refman/5.1/en/flush.html

