From: Sean Davis <sdavis2@mail.nih.gov>
To: NSO <nso@fmf.vtu.lt>
To: pgsql-performance@postgresql.org
Subject: Re: Bytea poor performance
Date: Sat, 15 Oct 2005 09:40:28 -0400
Message-ID: <BF767F0C.10CEA%sdavis2@mail.nih.gov> (raw)
In-Reply-To: <17260.81.7.89.65.1129382454.squirrel@fmf.vtu.lt>
On 10/15/05 9:20 AM, "NSO" <nso@fmf.vtu.lt> wrote:
> Hello,
>
> I am trying to select form table with bytea field. And queries runs very
> slow.
> My table:
> CREATE TABLE files (file bytea, nr serial NOT NULL) WITH OIDS;
>
> Query:
> select * from files where nr > 1450
>
> (I have total 1500 records in it, every holds picture of 23kB size)
> Query runs very long:
> Total query runtime: 23625 ms.
> Data retrieval runtime: 266 ms.
> 50 rows retrieved.
>
> explain:
> Index Scan using pk on files (cost=0.00..3.67 rows=50 width=36)
> Index Cond: (nr > 1450)
>
> Is it possible to do something with it? or it is normal? Our server is
> fast, and all other tables work fine..
How about some explain analyze output? Have you done a full vacuum lately?
How about reindexing?
Sean
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To: pgsql-performance@postgresql.org
Cc: sdavis2@mail.nih.gov, nso@fmf.vtu.lt
Subject: Re: Bytea poor performance
In-Reply-To: <BF767F0C.10CEA%sdavis2@mail.nih.gov>
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