Re: A problem

Late as it is, I'll try this monday. I hope it works, other suggestions
still welcome of course, thanks very much.

On Fri, 27 Jun 2003, Tom Lane wrote:

> Sam Barnett-Cormack <s(dot)barnett-cormack(at)lancaster(dot)ac(dot)uk> writes:
> > [ accidentally clobbered pg_control ]
>
> It sounds like the main problem is too small a value in the XID
> (transaction ID) counter, so that all your data tuples appear to be in
> the future. pg_resetxlog has an option to force an initial XID but
> you need to use it. You can guess a suitable XID by looking at the
> names of the old clog files --- you want something that will be past
> the end of the newest clog file, keeping in mind that there are 1M
> (1024^2) XIDs per clog file and that the clog file names are in hex.
> (I am not sure, but you might also need to provide a zero-filled clog
> file spanning the point you start XID at.)
>
> You will also need to be sure that the WAL file position
> is greater than the end of the old WAL --- again, look at the existing
> WAL files to see the largest number, and pick something bigger.
>
> BTW, make real sure that pg_control is set up with the same locale
> values as you were using before, or you'll be in a world of hurt
> with corrupt indexes. Use pg_controldata to look at what you have put
> into pg_control. (If you're not sure what was there before, get an
> old copy of pg_control off your last backup tape ... you do have a
> filesystem backup someplace, I trust ...)
>
> > I still have the old
> > /data/base dir, all that has been altered in there (recent mtime) is
> > base/1175459/pg_internal.init
>
> You can and probably should blow away pg_internal.init --- it's just a
> cache file and can be rebuilt. I'd not trust it at this point.
>
> regards, tom lane
>

--

Sam Barnett-Cormack
Software Developer | Student of Physics & Maths
UK Mirror Service (http://www.mirror.ac.uk) | Lancaster University