| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Andrew Sullivan <ajs(at)crankycanuck(dot)ca>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Some queries starting to hang |
| Date: | 2006-06-06 14:43:25 |
| Message-ID: | 17148.1149605005@sss.pgh.pa.us |
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| Lists: | pgsql-performance |
Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> On Mon, 2006-06-05 at 17:06 -0400, Tom Lane wrote:
>> Well, it's a big query. If it ought to take a second or two, and
>> instead is taking an hour or two (1800 times the expected runtime), that
>> might be close enough to "never" to exhaust Chris' patience. Besides,
>> we don't know whether the 1800 might itself be an underestimate (too bad
>> Chris didn't provide EXPLAIN ANALYZE results).
> This is a good example of a case where the inefficiency of EXPLAIN
> ANALYZE would be a contributory factor to it not actually being
> available for diagnosing a problem.
Huh? The problem is the inefficiency of the underlying query.
regards, tom lane
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