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Re: caching indexes and pages?

From: Kenneth Marshall <ktm(at)rice(dot)edu>
To: Thomas Finneid <tfinneid(at)fcon(dot)no>
Cc: Thomas Markus <t(dot)markus(at)proventis(dot)net>,pgsql-performance(at)postgresql(dot)org
Subject: Re: caching indexes and pages?
Date: 2009-01-22 22:03:33
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Thu, Jan 22, 2009 at 10:58:25PM +0100, Thomas Finneid wrote:
> Thomas Markus wrote:
>> try to reorganize your data with CLUSTER and create appropriate indixes 
>> (dont forget to check statistics).
> One question. Assume I have clustered and new data has been added after 
> that, according to the docs that data is added "outside" of the clustered 
> data. What happens when I run cluster again? I would assume its smart and 
> to only clusteres the new data, i.e. adding it to the already created 
> clusters, as apporpriate, so the execution time would be a lot lower, 
> right? or would it run through and recluster everything from scratch again?
> thomas
It reclusters again from scratch. You do get better performance on the
reads from the data that is already clustered.


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