Re: cache lookup failed for index

"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> OK, I think the appropriate next step would be to try to run the
> PostgreSQL cluster in single-user mode:

> http://www.postgresql.org/docs/8.1/interactive/app-postgres.html

> Try to REINDEX pg_class_oid_index in that mode. If that fails, it
> might possibly help to run these statements and try the REINDEX
> command again:

> set enable_indexscan = off;
> set enable_bitmapscan = off;

Those won't help. What you *will* need, in order to even start the
single-user backend, is to tell it to disregard system indexes
(-P command line option).

I wouldn't be too surprised if the corruption extends a lot further than
the one index :-( but maybe you will be able to extract something after
reindexing.

regards, tom lane