Re: vacuum error "left link changed unexpectedly"

Hello Tom,

thanks for your fast answer. And yes it is reproducible. It started
during my vacation (of course!!!) and I get the message ever since
(approx. 6 weeks, vacuum daily).

We use

Fedora Linux Core 2
PostgreSQL 7.4.2

I'll try to get the information you asked for over the weekend.

Ulrich


> Ulrich Wisser <ulrich.wisser@relevanttraffic.se> writes:
>
>>vacuumdb: vacuuming of database "CLIX2" failed: ERROR:  left link
>>changed unexpectedly
>
>
> Hm, is this repeatable?  When I wrote the code I thought it was
> a can't-happen case, which is why the error message is so terse
> (it was only pure paranoia that made me put in the check at all).
> I suppose it must indicate a corrupted index, but I'm not clear
> on exactly what the nature of the corruption is.
>
> You might proceed by fixing the error message to be a little more
> helpful, say
>
>     if (opaque->btpo_prev != leftsib)
>         elog(ERROR, "left link changed unexpectedly in block %u of index %s",
>              target, RelationGetRelationName(rel));
>
> (this is in src/backend/access/nbtree/nbtpage.c, about line 863 in
> current sources).  Once you know which index has the problem,
> I would like to see the output of pg_filedump on that index.
> After you've got the dump, a REINDEX should fix it.
>
> BTW, which Postgres version is this exactly?
>
>             regards, tom lane


--
Ulrich Wisser  / System Developer

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