Each of these columns is optional.
If these columns exist, MyDNS will notice this and enable additional code specific to each optional field.
If you add any of these fields to your database, you must signal MyDNS to rescan the tables by sending it a SIGHUP signal (see section 4.2 Signals).
3.4.1 any.active Activating and deactivating individual rows. 3.4.2 soa.xfer Zone transfer access rules.