Re: Fwd: Index on table when using DESC clause

From: Yves Vindevogel <yves(dot)vindevogel(at)implements(dot)be>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Fwd: Index on table when using DESC clause
Date: 2005-05-23 19:02:17
Message-ID: c4e0898e4059f6d3333ee2e59fd5c788@implements.be
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I tried that, but

create index ixTest on table1 (pages desc, documentname)

gives me a syntax error

On 23 May 2005, at 20:03, Steinar H. Gunderson wrote:

> On Mon, May 23, 2005 at 07:41:19PM +0200, Yves Vindevogel wrote:
>> However, when I query my db using for instance order by pages,
>> documentname, it is very fast.
>> If I use order by pages desc, documentname, it is not fast at
>> all, like it is not using the index properly at all.
>
> Make an index on "pages desc, documentname asc".
>
> /* Steinar */
> --
> Homepage: http://www.sesse.net/
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 9: the planner will ignore your desire to choose an index scan if
> your
> joining column's datatypes do not match
>
>
Met vriendelijke groeten,
Bien à vous,
Kind regards,

Yves Vindevogel
Implements

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