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

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

By default, FLUSH statements are written to the binary log so that they
will be replicated to replication slaves. Logging can be suppressed
with the optional NO_WRITE_TO_BINLOG keyword or its alias LOCAL.

*Note*: FLUSH LOGS, FLUSH MASTER, FLUSH SLAVE, and FLUSH TABLES WITH
READ LOCK are not written to the binary log in any case because they
would cause problems if replicated to a slave.

The RESET statement is similar to FLUSH. See [HELP RESET], for
information about using the RESET statement with replication.

URL: http://dev.mysql.com/doc/refman/5.0/en/flush.html

