Re: [HACKERS] major flaw in 6.5beta1??? (UPDATE/INSERT waiting)

Your e-mail did not arrive at its intended destination. You need to
send it to Michael J. Davis, not Michael Davis

From: Dirk Lutzebaeck <lutzeb @ aeccom.com> on 05/05/99 03:30 AM
To: Tom Lane <tgl @ sss.pgh.pa.us>@SMTP(at)EXCHANGE
cc: hackers @ postgreSQL(dot)org(at)SMTP@EXCHANGE
Subject: Re: [HACKERS] major flaw in 6.5beta1???
(UPDATE/INSERT waiting)

Tom Lane writes:
> Dirk Lutzebaeck <lutzeb(at)aeccom(dot)com> writes:
> > cs=> select envelope from recipient where envelope=510349;
> > [ returns a tuple that obviously fails the WHERE condition ]
>
> Yipes. Do you have an index on the envelope field, and if so is
> it being used for this query? (Use EXPLAIN to check.) My guess
> is that the index is corrupted. Dropping and recreating the
index
> would probably set things right.

Yes, thanks, recreating the index cures the problem.

> Of course the real issue is how it got corrupted. Hiroshi found
> an important bug in btree a few days ago, and there is a
discussion
> going on right now about lock-manager bugs that might possibly
allow
> multiple backends to corrupt data that they're concurrently
updating.
> But I have no idea if either of those explains your problem.

Does this mean they can deadlock themselves? Is this also true for
6.4.2? I probably switch back then.

Thanks, Dirk