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Re: BUG #5932: CLUSTER doesn't update n_dead_tup

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Andy Lester <andy(at)petdance(dot)com>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #5932: CLUSTER doesn't update n_dead_tup
Date: 2011-09-06 14:04:42
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
Andy Lester wrote:
> On Sep 5, 2011, at 3:19 PM, Bruce Momjian wrote:
> > 
> > This is an interesting bug report from March that got no replies.  In my
> > testing, not only does CLUSTER not update the n_dead_tup statistics, but
> > neither does VACUUM FULL, which internally uses the CLUSTER code
> > (cluster_rel()).  Is this a bug?
> I can't imagine how it NOT be a bug to do something that gets rid of dead tuples and then tell the user there are dead tuples when there are actually no dead tuples.

Well, if you TRUNCATE I don't think it updates the statistics either.  I
think we assume the autovacuum system will analyse the new table soon.

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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