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How many file descriptors does postgres need?

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G'day all,

We recently had a bit of a catastrophe when one of our postgres databases opened too many files.  It was a reasonably easy fix, but it did get me thinking.  Is there a rule of thumb in determining how many file descriptors should be available to a postgres database/cluster?

I'd be happy to set it to some large number, but I'd really like some confidence about how much the database can grow with a new limit.

Cheers!

--Royce


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