FLUSH ATTRIBUTES

The FLUSH ATTRIBUTES command flushes all in-memory attribute updates in all the active disk tables to disk. It returns a tag that identifies the result on-disk state (which is basically a number of actual disk attribute saves performed since the server startup).

mysql> UPDATE testindex SET channel_id=1107025 WHERE id=1;
Query OK, 1 row affected (0.04 sec)

mysql> FLUSH ATTRIBUTES;
+------+
| tag  |
+------+
|    1 |
+------+
1 row in set (0.19 sec)

FLUSH HOSTNAMES

The FLUSH HOSTNAMES command is used to renew IP addresses associated with agent host names. If you want to always query the DNS for getting the host name IP, you can use the hostname_lookup directive.

mysql> FLUSH HOSTNAMES;
Query OK, 5 rows affected (0.01 sec)