Re: Very slow bytea data extraction

From: Richard Huxton <dev(at)archonet(dot)com>
To: "msmbarabino(at)virgilio(dot)it" <msmbarabino(at)virgilio(dot)it>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Very slow bytea data extraction
Date: 2007-02-23 10:46:14
Message-ID: 45DEC5F6.4000101@archonet.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-performance

msmbarabino(at)virgilio(dot)it wrote:
> Hi all,
> I'm using Postgresql 8.2.3 on a Windows XP system.
>
> I need to
> write and retrieve bytea data from a table.
> The problem is that, while
> data insertion is quite fast, bytea extraction is very slow.
> I'm trying
> to store a 250KB image into the bytea field.
> A simple select query on a
> 36-row table takes more than one minute to execute.

Where is the problem?

Is it in executing the query (what does EXPLAIN ANALYSE show)?
Is it in fetching/formatting the data (what does the equivalent COUNT(*)
show)?
How are you accessing the database: odbc,jdbc,other?
Does it do this with psql too?

--
Richard Huxton
Archonet Ltd

In response to

Browse pgsql-performance by date

  From Date Subject
Next Message msmbarabino@virgilio.it 2007-02-23 12:19:56 R: Very slow bytea data extraction
Previous Message msmbarabino@virgilio.it 2007-02-23 10:10:13 Very slow bytea data extraction