Re: after using pg_resetxlog, db lost

"Shea,Dan [CIS]" <Dan(dot)Shea(at)ec(dot)gc(dot)ca> writes:
> I determined the largest was 12,293,162 and set it to
> pg_resetxlog -x 15000000 /var/lib/pgsql/data

Okay, but it looks like you will also need to adjust pg_clog to cover
that transaction ID range. (I had thought pg_resetxlog would handle
this for you, but it looks like not.)

> Jun 24 15:02:05 murphy postgres[28061]: [11-1] PANIC: could not access status of transaction 15000030
> Jun 24 15:02:05 murphy postgres[28061]: [11-2] DETAIL: could not read from file "/var/lib/pgsql/data/pg_clog/000E" at offset 73728: Success

You need to append zeroes (8K at a time) to
/var/lib/pgsql/data/pg_clog/000E until it's longer than 73728 bytes.
I'd use something like
dd bs=8k count=1 </dev/zero >>/var/lib/pgsql/data/pg_clog/000E
assuming that your system has /dev/zero.

regards, tom lane