Re: autovacuum template0

Tom Lane wrote:
> Jacob Coby <jcoby(at)listingbook(dot)com> writes:
>> I then tried:
>> foo=# select * from pg_catalog.pg_statistic ;
>> ERROR: could not access status of transaction 3242180415
>> DETAIL: could not open file "pg_clog/0C13": No such file or directory
>
>> so it seems that pg_catalog.pg_statistic has somehow become corrupt on
>> template0?
>
> Yeah, that's what it looks like. If you're interested in digging into
> why, it'd be productive to run "pg_filedump -i -f" on the table
> (see http://sources.redhat.com/rhdb/ for that utility).

I wasn't able to build that utility due to dependencies that I didn't
have the patience to chase down.

> If you just want to get out of the problem, it's fortunately not hard
> because pg_statistic is all derived data. Go into template0, TRUNCATE
> pg_statistic, and then VACUUM ANALYZE to regenerate it and VACUUM FREEZE
> to re-freeze template0. (You'll need to fool with
> pg_database.datallowconn to let yourself into template0. Read the
> manual's bit about template databases if you aren't sure what you're
> doing here.)

That worked perfectly. Thanks.