Re: Finding time in WAL logs

On Wed, 2007-04-25 at 13:13 -0400, Pascal Robert wrote:
> Le 07-04-25 à 11:43, Simon Riggs a écrit :
>
> > On Wed, 2007-04-25 at 11:28 -0400, Pascal Robert wrote:
> >
> >> I'm writing our backup procedure for using WAL and PITR, but to be
> >> able to do a (mostly) perfect PITR, I need to find the time when a
> >> error (DELETE FROM, DROP TABLE, etc.) was made so that I can do a
> >> restore just before the error.
> >>
> >> Does PostgreSQL has something similar to "mysqlbinlog" so that I can
> >> look at the content of a WAL archive ? I tried enabling
> >> "log_min_messages" at "info" level, but it doesn't log the date and
> >> time of a executed statement, so that's not a solution.
> >
> > http://pgfoundry.org/projects/xlogviewer/
> >
> > I'd appreciate some feedback. I'll be looking to release a new version
> > within next few months.
>
> When I look at a log with xlogdump -s /tmp/NAMEOFWAL, I always get
> this at the end :
>
> Unable to read continuation page?

It's not that smart about where it stops.

> BTW, the statements look like this :
>
> 0/15FFE470: prv 0/15FFE440; xid 2332; HEAP info 10 len 18 tot_len 46
> DELETE FROM 16612 WHERE ...delete: ts 1663 db 16384 rel 16612 block
> 1413 off 5
>
> (this is for a DELETE FROM table without any WHERE clause). I see
> the XID, but can you also display date and time in the ouput ?

Original date/time is available only on COMMIT/ABORT records, so you'll
need to search ahead/behind.

--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com