Intermittently, the database connection function in PHP will fail for two of those three sites. (I checked, and the function is identical, except for user/password/database arguments, between the three sites.) mysqld is still running on the server; however, if I restart mysqld, the sites resume working.
I haven't been able to deliberately crash the sites, nor have I been able to confirm absolutely that it only affects the two sites. System load doesn't appear to be an issue; the only time I've seen load average approach 1.0 was when I did the initial fcheck run. I also checked the users in mysql, and all three have identical permissions. Nothing helpful in any error logs.
Right now I have a kludge going where the failure case in the database connect function drops a file in a particular path (much like a lockfile) and a perl script (run every five minutes by cron) restarting mysql (and deleting the file) if it finds that file present. Not a real good option for long-term site operation (but handy, I suppose...)
How can I figure out if the problem resides with MySQL (suggested by the fact that a mysqld restart helps - resource issue?) or with PHP (suggested by how it doesn't affect all three sites)? I'd like to get this sorted before I move the two last (and biggest) sites out of shared hosting.
Thanks for any hints...
pjm
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