From: Merlin Moncure <mmoncure@gmail.com>
To: femski <hypertree@yahoo.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres batch write very slow - what to do
Date: Tue, 13 Mar 2007 07:40:49 -0500
Message-ID: <b42b73150703130540sf2a388ka2d5e5e4341d9272@mail.gmail.com> (raw)
In-Reply-To: <9452092.post@talk.nabble.com>
References: <9452092.post@talk.nabble.com>
On 3/13/07, femski <hypertree@yahoo.com> wrote:
>
> Folks !
>
> I have a batch application that writes approx. 4 million rows into a narrow
> table. I am using JDBC addBatch/ExecuteBatch with auto commit turned off.
> Batch size is 100. So far I am seeing Postgres take roughly five times the
> time it takes to do this in the Oracle.
>
> I have played with many parameters. Only one that seems to have any affect
> is fsync - but thats only 10% or so.
> Initially I got the warning that checkpoints were happening too often so I
> increased the segments to 24. Warnings stopped, but no real improvement in
> performance.
>
> Is postgres really that slow ? What am I missing ?
how many inserts/sec are you getting approximately. Maybe you have
some type of network issue.
merlin
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To: pgsql-performance@postgresql.org
Cc: mmoncure@gmail.com, hypertree@yahoo.com
Subject: Re: Postgres batch write very slow - what to do
In-Reply-To: <b42b73150703130540sf2a388ka2d5e5e4341d9272@mail.gmail.com>
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