Re: R: 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: R: Very slow bytea data extraction
Date: 2007-02-23 14:39:21
Message-ID: 45DEFC99.4070408@archonet.com
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msmbarabino(at)virgilio(dot)it wrote:
> Thanks for your reply,
>
>
>> Is it in executing the query (what does
> EXPLAIN ANALYSE show)?
>
> Here is the output of explain analyze SELECT *
> FROM "FILE"
>
> "Seq Scan on "FILE" (cost=0.00..1.36 rows=36 width=235)
> (actual time=0.023..0.107 rows=36 loops=1)"

If you look at the "actual time" it's completing very quickly indeed. So
- it must be something to do with either:
1. Fetching/formatting the data
2. Transferring the data to the client.

What happens if you only select half the rows? Does the time to run the
select halve?

--
Richard Huxton
Archonet Ltd

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