From: hubert depesz lubaczewski <depesz@depesz.com>
To: Cédric Villemain <cedric.villemain.debian@gmail.com>
Cc: Divakar Singh <dpsmails@yahoo.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Insert performance with composite index
Date: Tue, 2 Nov 2010 10:45:39 +0100
Message-ID: <20101102094539.GA6686@depesz.com> (raw)
In-Reply-To: <AANLkTi=CSjxW9K67EP0SVu-_J1YM4eSPkHaziC_88YTP@mail.gmail.com>
References: <293254.80548.qm@web65413.mail.ac4.yahoo.com>
<AANLkTi=CSjxW9K67EP0SVu-_J1YM4eSPkHaziC_88YTP@mail.gmail.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.
Best regards,
depesz
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To: pgsql-performance@postgresql.org
Cc: depesz@depesz.com, cedric.villemain.debian@gmail.com, dpsmails@yahoo.com
Subject: Re: Insert performance with composite index
In-Reply-To: <20101102094539.GA6686@depesz.com>
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