Store the database last-modification-time somewhere. Check your locally stored last-modification-time against the database's. Query the database only if it is has been updated.

I use a simple file for that (just use  -M to check the file time).

update: other ways: use IPC, use the database itself, ...

In reply to Re: refreshing data across children in Apache by fglock
in thread refreshing data across children in Apache by Anonymous Monk

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