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Re: Server just hanging (Copying to tmp table)
Posted by: Shawn Hogan
Date: August 31, 2005 03:32PM

Maybe it's not necessarily a platform issue, but springs up more often in platforms that impose open file limits per user.

I don't know enough about the guts of MySQL to know what would happen, but in my case Mac OS X Server by default allows 1024 (non-server Mac OS X is 256 just in case anyone reads this and needs to know) open files per user, at the same time the open_files_limit variable for MySQL is set to 5010 (I'm assuming that's default).

So in theory, what would happen if the mysql user had 1024 files already open and then tried to open another one (in this case a temp table)? Would it just hang by chance?

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