From: | Chris Mair <chrisnospam(at)1006(dot)org> |
---|---|
To: | Peter Bauer <peter(dot)m(dot)bauer(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Major Performance decrease after some hours |
Date: | 2006-10-01 10:43:05 |
Message-ID: | 1159699385.14861.6.camel@ultra.home.lan |
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Thread: | |
Lists: | pgsql-general |
Hi,
a few random question...
> > i have a Tomcat application with PostgreSQL 8.1.4 running which
> > performs about 10000 inserts/deletes every 2-4 minutes and updates on
> > a database and after some hours of loadtesting the top output says
> > 0.0% idle, 6-7% system load, load average 32, 31, 28
Who is responsible for this high load values?
Do you see many postmaster processes at the top?
> and there are
> > many exceptions at statement execution like:
> > An I/O error occured while sending to the backend.
Is this from the application?
How many connections does the application open in parallel?
Using JDBC, I guess?
> > - Each Cluster has 4 drbd Devices, one for the PostgreSQL data
> > - Two of these clusters are using the same PostgreSQL installation to
> > share the data, the database can be moved from one cluster to the
> > other in case of failure
Just to be 100% sure: just one server at a time runs PostgreSQL on
that shared data disk, right?
Bye,
Chris.
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