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@TinLy, Unless your client has direct access to your database some how, presumably they are changing it by making a request to some script you have on the server and sending it information. If that's true then you can simply "do something" at that point rather than having to constantly poll your database. Otherwise, stick with polling if you want but limit your query rate to something acceptable which might mean the detection of said change may be delayed a bit. For example, maybe wait a minute etween checks, or 5 minutes if that's still too much. You're being too vague about your situation to really provide any better help. If you need more help you'll have to start getting into specifics instead of just saying "something changed", "do something", "client", etc.

Simple question now. Who is doing the changing? Is it a script that you have control of or access to ? I'm sure you can see where I am going here.