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Re: how could select id=xx so slow? - Mailing list pgsql-performance

From Craig Ringer
Subject Re: how could select id=xx so slow?
Date
Msg-id 4FF6C90B.8070402@ringerc.id.au
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In response to how could select id=xx so slow?  (Yan Chunlu <springrider@gmail.com>)
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On 07/06/2012 02:17 PM, Yan Chunlu wrote:

> so I wonder could this simple select is innocent and affected badly by
> other queries? how could I find those queries that really slow down
> the database?

It might not be other queries. Your query could be taking that long
because it was blocked by a lock during maintenance work (say, an ALTER
TABLE). It's also quite possible that it was held up by a slow
checkpoint; check your logs to see if there are warnings about
checkpoint activity.

--
Craig Ringer

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