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From: sparikh <sparikh@ecotality.com>
To: pgsql-performance@postgresql.org
Subject: Re: Hot Standby performance issue
Date: Mon, 21 Oct 2013 15:59:37 -0700 (PDT)
Message-ID: <1382396377294-5775349.post@n5.nabble.com> (raw)
In-Reply-To: <5265A28E.4060601@fuzzy.cz>
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Yes, Expalin without Analyze is taking long. It is weird. In the
pg_stat_activity Explain was the only query running. So server was almost
idle. Using New relic interface I checked CPU was almost idle - around
10-20%. There were some IO activity - around 40-50%.

I forgot to mention before I could run perf on command line even with root
permission. It says command not found. May be utility is not installed or
not enabled.

I have attached the snapshot of vmstat while explain was running in
background. vmstat.txt
<http://postgresql.1045698.n5.nabble.com/file/n5775349/vmstat.txt;  

Do you suggest if I remove all the data files from /data/base folder of
standby and again rebuild using rsync from primary ? do you see any issues
there.? This is just to rule out any fragmentation on standby side.

Our sys admin is planning to run fsck sometime today or tomorrow.

Thanks.









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