From: Cédric Villemain <cedric.villemain.debian@gmail.com>
To: depesz@depesz.com
Cc: Divakar Singh <dpsmails@yahoo.com>; pgsql-performance@postgresql.org
Sent: Tue, November 2, 2010 4:34:42 PM
Subject: Re: [PERFORM] Insert performance with composite index
2010/11/2 hubert depesz lubaczewski <
depesz@depesz.com>:
> On Mon, Nov 01, 2010 at 02:57:56PM +0100, Cédric Villemain wrote:
>> > CONSTRAINT tableindex_pkey PRIMARY KEY (tableindex)
>> > )
>> > the index definition is
>> > CREATE INDEX "PK_AT2"
>> > ON ABC
>> > USING btree
>> > (event, tableindex)
>> > TABLESPACE sample;
>>
>> Indexing twice the same column is useless. (perhaps move your PK to
>> the tablespace 'sample' is good too ?)
>
> why do you say that?
> these are not the same indexes and they serve different purposes.
Given that tableindex is the PK column, I really like to now the usage
pattern for having it indexed twice.
>
> Best regards,
>
> depesz
>
> --
> Linkedin:
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>
--
Cédric Villemain 2ndQuadrant
http://2ndQuadrant.fr/ PostgreSQL : Expertise, Formation et Support
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