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Re: How to reindex when unable to open relation?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Darren Reed <darrenr+postgres(at)fastmail(dot)net>
Cc: Shoaib Mir <shoaibmir(at)gmail(dot)com>, pgsql-admin(at)postgresql(dot)org
Subject: Re: How to reindex when unable to open relation?
Date: 2008-02-27 16:54:00
Message-ID: 29644.1204131240@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-admin
Darren Reed <darrenr+postgres(at)fastmail(dot)net> writes:
> Tom Lane wrote:
>> I'm curious though exactly where the failure is, because there's not
>> much in RelationCacheInitializePhase2 that looks like it could crash,

> #0  0x08298378 in RelationCacheInitializePhase2 () at relcache.c:2394
> 2394                    LOAD_CRIT_INDEX(AttributeRelidNumIndexId);
> (gdb) where
> #0  0x08298378 in RelationCacheInitializePhase2 () at relcache.c:2394
> #1  0x082ac19c in InitPostgres (dbname=0x83ba450 "postgres",
>     username=0x83c1428 "postgres") at postinit.c:459

Hmph.  AFAICS the only possible way it could dump core right there is
if RelationBuildDesc returned NULL or a bogus pointer.  And
RelationBuildDesc does have a NULL return defined: if it couldn't find
a pg_class row for the relation.  (So we probably ought to add an
explicit error test to LOAD_CRIT_INDEX --- surprising it hasn't been
seen before.)  Anyway it seems that the problem is you are missing
the pg_class row for pg_attribute_relid_attnum_index.  And possibly
other stuff too; this crash is mighty early in initialization and
only a couple of core tables have been touched yet.  What I fear
is that one or more whole pages of pg_class have been lost --- either
zeroed out or corrupted in a way that heapscan doesn't notice.  You
might be able to learn something from pg_filedump if you're interested
in pursuing this for forensic purposes, but I'm afraid the odds of
getting anything back from this database are mighty low.

			regards, tom lane

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