Re: where is pg_resetxlog ? - Mailing list pgsql-general

On Saturday 25 July 2009 20:05:14 Scott Marlowe wrote:
> On Sat, Jul 25, 2009 at 1:30 PM, Kevin
>
> Kempter<kevink@consistentstate.com> wrote:
> > On Saturday 25 July 2009 13:23:54 Scott Marlowe wrote:
> >> On Sat, Jul 25, 2009 at 1:08 PM, Kevin
> >>
> >> Kempter<kevink@consistentstate.com> wrote:
> >> > On Saturday 25 July 2009 13:02:52 Scott Marlowe wrote:
> >> >> On Sat, Jul 25, 2009 at 12:55 PM, Kevin
> >> >>
> >> >> Kempter<kevink@consistentstate.com> wrote:
> >> >> > Hi all;
> >> >> >
> >> >> > I'm trying to restore from a tar of the filesystem on a debian box
> >> >> > and I get xlog errors.
> >> >> >
> >> >> > I suspect I need to run pg_resetxlog but I cannot find it anywhere,
> >> >> > where would I find pg_resetxlog on a debian box that was installed
> >> >> > via the deb packages ? or how do I get it ?
> >> >>
> >> >> Wait, if you're restoring a backup, to a freshly initted db, then you
> >> >> shouldn't be getting any kind of pg_xlog errors.  If you are, then
> >> >> there's likely something wrong with your server that pg_resetxlog
> >> >> isn't going to fix in the long term.  Are you running on windows with
> >> >> anti-virus software or have some other kind of possible problem that
> >> >> could be causing a problem with the postmaster writing to the hard
> >> >> drives?
> >> >
> >> > we're not restoring from a pg_dump. We were in the process of moving
> >> > the db to a new server. We brought the db down (on host A) and did an
> >> > rsync of all the db dir's (including tablespace dir's) to host B.
> >> >
> >> > Then bad things were done to host A and we want to get back to where
> >> > we started. So, we stopped the db on host A and rsync'ed the files
> >> > back from host B to host A.  Now when I try and start the db I see all
> >> > these tx sement errors in the log.
> >> >
> >> > We're actually ok if we loose anything that was in the pg_xlog dir.
> >>
> >> Did you rsync the pg_xlog and pg_clog (i.e. EVERYTHING under data/) or
> >> just the base directory?  You really need to do an rsync of
> >> everything, not most everything.
> >
> > we rsync'ed EVERYTHING (the entire directory and all sub-dirs)
>
> OK, on my laptop, in the /var/lib/postgresql/8.3/main there's a bunch
> of dirs that look like this:
>
> base    pg_clog       pg_subtrans  pg_twophase  pg_xlog
> postmaster.pid  server.crt
> global  pg_multixact  pg_tblspc    PG_VERSION   postmaster.opts
> root.crt        server.key
>
> Did you rsync the base dir only, or all of the directories above?
> Cause if you just rsynced base, you need the rest of them, as well.

I rsync'd the /var/lib/postgresql/8.3/main dir. However several of the sub-
dirs were soft links (pg_xlog, server.cert, root.cert and server.key) so I
unfortunately did not get the data from the links' real location since they
all pointed to outside of the /var/lib/postgresql/8.3/main tree