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* Query is sometimes fast and sometimes slow: what could be the reason?
@ 2022-09-14 15:02 tiaswin@gmx.de
0 siblings, 1 reply; 2+ messages in thread
From: tiaswin@gmx.de @ 2022-09-14 15:02 UTC (permalink / raw)
To: pgsql-performance@lists.postgresql.org
<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>What could be the reason of a query, which is sometimes fast and sometimes slow (factor >10x)?</div>
<div>(running on a large table).</div>
<div> </div>
<div> </div></div></body></html>
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Query is sometimes fast and sometimes slow: what could be the reason?
@ 2022-09-14 15:59 Justin Pryzby <pryzby@telsasoft.com>
parent: tiaswin@gmx.de
0 siblings, 0 replies; 2+ messages in thread
From: Justin Pryzby @ 2022-09-14 15:59 UTC (permalink / raw)
To: tiaswin@gmx.de; +Cc: pgsql-performance@lists.postgresql.org
On Wed, Sep 14, 2022 at 05:02:07PM +0200, tiaswin@gmx.de wrote:
> <html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>What could be the reason of a query, which is sometimes fast and sometimes slow (factor >10x)?</div>
> <div>(running on a large table).</div>
> <div> </div>
> <div> </div></div></body></html>
Lots of possible issues. Is it using a different query plan ?
Collect a good plan and a bad one and compare, or send both.
Perhaps use autoexplain to do so.
Turn on logging and send as much information as you can as described
here.
https://wiki.postgresql.org/wiki/Slow_Query_Questions
Please try to configure your mail client to send text mail (instead of
or in addition to the html one).
--
Justin
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2022-09-14 15:02 Query is sometimes fast and sometimes slow: what could be the reason? tiaswin@gmx.de
2022-09-14 15:59 ` Justin Pryzby <pryzby@telsasoft.com>
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