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Re: Queries very slow and memory consumption too high

From: Saurabh Dave <saurabhdave(at)gmail(dot)com>
To: Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: Queries very slow and memory consumption too high
Date: 2009-06-23 01:48:05
Message-ID: fdd0c0f90906221848x345a0a04pab79592740c144f@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-jdbc
Thanks Albe,

"You'll have to analyze *what* is slow."

That is an excellent question, which I am struggling to answer.
As per your recommendation I moved DB Server on a remote machine and made
following changes:
1. Postgres version 8.3.7.1 instead of 8.2
2. DB encoding changed from UTF-8 to SQL_ANSCII

Now I see the performance of my application to be quite fast, I need to
observe it for some more time though.

But over the top, do you think that changing the encoding would make
difference?

Thanks,
Saurabh

On Mon, Jun 22, 2009 at 1:02 PM, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>wrote:

> Saurabh Dave wrote:
> > I am using Postgres 8.2.10 + Hibernate + c3p0 connection pooling.
> > For our application we support MySQL + Oracle + MSSQL + Postgres.
> >
> > With all the other databases our application is working quite
> > fine, but with Postgres after a day queries are becoming
> > extremely slow and it seems to be taking up all the available memory.
> >
> > Please let me know what could be the issue. I am new to
> > Postgres, so any help would be greatly appreciated.
>
> You'll have to analyze *what* is slow.
>
> Is it the database server or some other component?
>
> It helps to have the various components installed on different machines.
>
> Once you have found out what is slow, drill down there.
>
> If it turns out to be the database and need help, you'll have to provide
> EXPLAIN ANALYZE output of a sample query that runs fast in the
> beginning and slow later.
>
> Yours,
> Laurenz Albe
>

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