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Re: BUG #4567: Clustering on GIST INDEX clobbers records in table intermittently

From: "Obe, Regina" <robe(dot)dnd(at)cityofboston(dot)gov>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-bugs(at)postgresql(dot)org>,<postgis-devel(at)postgis(dot)refractions(dot)net>
Subject: Re: BUG #4567: Clustering on GIST INDEX clobbers records in table intermittently
Date: 2008-12-08 07:51:09
Message-ID: 53F9CF533E1AA14EA1F8C5C08ABC08D204D7F07A@ZDND.DND.boston.cob (view raw or flat)
Thread:
Lists: pgsql-bugs
"Regina Obe" <robe(dot)dnd(at)cityofboston(dot)gov> writes:
> Description:        Clustering on GIST INDEX clobbers records in table
> intermittently

> This doesn't always happen to me but does intermittently, and for others it
> happens all the time.

> I wonder whether this is fixed by this recent patch:
> http://archives.postgresql.org/pgsql-committers/2008-12/msg00053.php

> The pre-patch behavior would've depended on the value of a
> never-initialized struct field, so the erratic behavior is explained
> by varying contents of memory.  I'm unable to make it happen in an
> assert-enabled build, but that's probably because the initial contents
> of a palloc'd chunk are never zeroes in such a build.

>			regards, tom lane

Tom,

Thanks for the quick response on this.  

Paul, 
You think by chance you can test out the patch since you can make this bug happen consistently on your build.

Thanks,
Regina





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Subject: BUG #4568: sporadic error doing COUNT(*) on empty table
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