From: | Adrian Moisey <adrian(at)careerjunction(dot)co(dot)za> |
---|---|
To: | Greg Smith <gsmith(at)gregsmith(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: strange pauses |
Date: | 2008-01-17 06:50:24 |
Message-ID: | 478EFAB0.30205@careerjunction.co.za |
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Thread: | |
Lists: | pgsql-performance |
Hi
>> Search this list for references to "checkpoints". If you run
>> vmstat/iostat for a bit you should see bursts of disk activity at
>> those times.
>
> The most straightforward way to prove or disprove that the slow queries
> line up with checkpoints is to set to checkpoint_warning to a high value
> (3600 should work), which should log every checkpoint, and then see if
> they show up at the same time in the logs.
You guys were spot on. During these pauses the IO goes up high.
I've got the following set:
checkpoint_timeout = 5min
checkpoint_warning = 3600s
log_min_messages = info
But I see nothing in the logs about checkpoints
--
Adrian Moisey
System Administrator | CareerJunction | Your Future Starts Here.
Web: www.careerjunction.co.za | Email: adrian(at)careerjunction(dot)co(dot)za
Phone: +27 21 686 6820 | Mobile: +27 82 858 7830 | Fax: +27 21 686 6842
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