| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Merlin Moncure" <merlin(dot)moncure(at)rcsonline(dot)com> |
| Cc: | "Marius Andreiana" <mandreiana(at)rdslink(dot)ro>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: NOT IN query takes forever |
| Date: | 2004-08-03 14:59:17 |
| Message-ID: | 23045.1091545157@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-performance |
"Merlin Moncure" <merlin(dot)moncure(at)rcsonline(dot)com> writes:
> Try bumping up shared buffers some and sort mem as much as you safely
> can.
sort_mem is probably the issue here. The only reasonable way to do NOT
IN is with a hash table, and the default setting of sort_mem is probably
too small to support a 137042-element table.
regards, tom lane
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