as_dbserver_check checks database servers' states by trying to connect
to them. If any server is down, alarm messages are emailed to your
company Web administrator and to your ISP support team (if needed).
When the server goes back online, you'll receive another email message
about it. Multiple DB servers of multiple DB types are supported. If you
have an SMS sending engine (callable from PHP), every DB server state
notification can be duplicated to SMS.
