When I set enable_seqscan to OFF and force everything to use the index every stock I query returns within 100ms, but turn seqscan back ON and its back up to taking several minutes for non-index using plans.
Any ideas? --Stephen
Try increasing your statistics target and re-running analyze. Try say 100?
Sincerely,
Joshua D. Drake
On Tue, 14 Sep 2004 21:27:55 +0200, Pierre-Frédéric Caillaud <[EMAIL PROTECTED]> wrote:
I have a table with ~8 million rows and I am executing a query which should return about ~800,000 rows. The problem is that as soon as I execute the query it absolutely kills my machine and begins swapping for 5 or 6 minutes before it begins returning results. Is postgres trying to load the whole query into memory before returning anything? Also, why would it choose not to use the index? It is properly estimating the # of rows returned. If I set enable_seqscan to off it is just as slow.
1; EXPLAIN ANALYZE.
Note the time it takes. It should not swap, just read data from the disk (and not kill the machine).
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