From: Scott Marlowe <smarlowe@g2switchworks.com>
To: Alvaro Herrera <alvherre@commandprompt.com>
Cc: andremachado <andremachado@techforce.com.br>
Cc: pgsql-performance@postgresql.org
Subject: Re: firebird X postgresql 8.1.2 windows, performance
Date: Tue, 07 Mar 2006 11:18:59 -0600
Message-ID: <1141751939.18820.174.camel@state.g2switchworks.com> (raw)
In-Reply-To: <20060307171514.GE6748@surnet.cl>
References: <20060307162842.M37264@techforce.com.br>
<1141751333.18820.172.camel@state.g2switchworks.com>
<20060307171514.GE6748@surnet.cl>
On Tue, 2006-03-07 at 11:15, Alvaro Herrera wrote:
> Scott Marlowe wrote:
>
> > Lastly, I noticed that after you clusters on all your indexes, the query
> > planner switched from a merge join to a hash join, and it was slower.
> > You might wanna try turning off hash joins for a quick test to see if
> > merge joins are any faster.
>
> Anyway please note that clustering "all indexes" does not really make
> sense. You can cluster only on one index. If you cluster on another,
> then the first clustering will be lost. Better make sure to cluster on
> the one index where it makes the most difference.
Note that I was referring to his clustering on an index for each table.
I.e. not on every single index. but he clustered on four tables /
indexes at once, so that was what I was referring to. Sorry for any
confusion there.
So, do you see any obvious, low hanging fruit here?
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To: pgsql-performance@postgresql.org
Cc: smarlowe@g2switchworks.com, alvherre@commandprompt.com, andremachado@techforce.com.br
Subject: Re: firebird X postgresql 8.1.2 windows, performance
In-Reply-To: <1141751939.18820.174.camel@state.g2switchworks.com>
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