Re: [RFC] CLUSTER VERBOSE

Added to TODO for CLUSTER:

o %Add VERBOSE option to report tables as they are processed,
like VACUUM VERBOSE

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Grzegorz Jaskiewicz wrote:
>
> On Mar 16, 2007, at 9:53 AM, Heikki Linnakangas wrote:
>
> > Grzegorz Jaskiewicz wrote:
> >> Because CLUSTER is divided into two major operations, (data
> >> reordering, index rebuild) - I see it this way:
> >> CLUSTER on I: <index name> T: <table name>, data reordering
> >> CLUSTER on I: <index name> T: <table name>, index rebuild
> >
> > Something like that would be nice to see how long each step takes,
> > like vacuum verbose.
> yup.
>
>
> >> I am looking for opinions, on what information should be presented.
> >
> > What would be useful is some kind of a metric of how (de)clustered
> > the table was before CLUSTER, and the same # of dead vs. live row
> > counts that vacuum verbose prints.
> Is that information available in cluster.c atm ? I am looking for
> some hints here. One of the reasons I decided to go with this patch,
> is to learn something - and cluster seems to be touching very 'bone'
> of postgres,
> tuples system (just like vacuum), and indices. I would appreciate any
> hints.
>
> > We don't really have a good metric for clusteredness, as have been
> > discussed before, so if you can come up with a good one that would
> > be useful in the planner as well, that would be great.
>
>
> I really don't know where and how should I calculate such param. Any
> hints ?
>
> thanks.
>
> --
> Grzegorz Jaskiewicz
>
> C/C++ freelance for hire
>
>
>
>
>
>
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