Message-ID: <41EFCC5B.5010302@archonet.com>
Date: Thu, 20 Jan 2005 15:20:59 +0000
From: Richard Huxton <dev@archonet.com>
User-Agent: Mozilla Thunderbird 1.0 (X11/20041206)
MIME-Version: 1.0
To: Andrei Bintintan <klodoma@ar-sd.net>
Cc: pgsql-sql@postgresql.org, pgsql-performance@postgresql.org
Subject: Re: [SQL] OFFSET impact on Performance???
References: <019f01c4fee1$1b58d600$0b00a8c0@forge>
	<41EF9FD3.5020400@archonet.com>
	<020d01c4fef6$595bb9d0$0b00a8c0@forge>
In-Reply-To: <020d01c4fef6$595bb9d0$0b00a8c0@forge>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Andrei Bintintan wrote:
>> If you're using this to provide "pages" of results, could you use a 
>> cursor?
> 
> What do you mean by that? Cursor?
> 
> Yes I'm using this to provide "pages", but If I jump to the last pages 
> it goes very slow.

DECLARE mycursor CURSOR FOR SELECT * FROM ...
FETCH FORWARD 10 IN mycursor;
CLOSE mycursor;

Repeated FETCHes would let you step through your results. That won't 
work if you have a web-app making repeated connections.

If you've got a web-application then you'll probably want to insert the 
results into a cache table for later use.

--
   Richard Huxton
   Archonet Ltd