Re: Force table to be permanently in cache? - Mailing list pgsql-performance

On Fri, Aug 29, 2003 at 02:52:10PM +0200, Fabian Kreitner wrote:
> Hi everyone,
>
> I have a sql request which on first invocation completes in ~12sec but then
> drops to ~3sec on the following runs. The 3 seconds would be acceptable but
> how can I make sure that the data is cached and all times? Is it simply
> enough to set shared_buffers high enough to hold the entire database (and
> have enough ram installed of course)? The OS is linux in this case.

If the table gets hit often enough, then it'll be in your filesystem
cache anyway.  See the many discussions of sizing shared_buffers in
the archives of this list for thoughts on how big that should be.

A

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