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Re: Index corruption

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jan Wieck <JanWieck(at)Yahoo(dot)com>
Cc: Marko Kreen <markokr(at)gmail(dot)com>, Marc Munro <marc(at)bloodnok(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Index corruption
Date: 2006-06-30 16:22:33
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Lists: pgsql-hackers
Jan Wieck <JanWieck(at)Yahoo(dot)com> writes:
> You're right ... forgot about that one.

> However, transactions from different origins are NEVER selected together 
> and it wouldn't make sense to compare their xid's anyway. So the index 
> might return index tuples for rows from another origin, but the 
> following qualifications against the log_origin in the heap tuple will 
> filter them out.

No, that's not the point here.  The point here is that if the xids that
are simultaneously present in the index span more than a 2G-XID range,
btree *will fail* because it will be dealing with keys that do not obey
the transitive law.  You do have a problem --- it doesn't explain Marc's
troubles, but sl_log_1_idx2 is broken for multi master situations.  All
you need is masters with sufficiently different XID counters.

			regards, tom lane

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