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Current group: pgsql.performance
Re: [SQL] OFFSET impact on Performance???
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| | From: | Spiegelberg, Greg | | Subject: | Re: [SQL] OFFSET impact on Performance??? | | Date: | Thu, 20 Jan 2005 13:04:02 -0500 |
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 | Isn't this a prime example of when to use a servlet or something similar
in function? It will create the cursor, maintain it, and fetch against
it for a particular page.
Greg
-----Original Message-----
From: Richard Huxton [mailto:dev@archonet.com]
Sent: Thursday, January 20, 2005 10:21 AM
To: Andrei Bintintan
Cc: pgsql-sql@postgresql.org; pgsql-performance@postgresql.org
Subject: Re: [PERFORM] [SQL] OFFSET impact on Performance???
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
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