| From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
|---|---|
| To: | Jaime Casanova <systemguards(at)gmail(dot)com> |
| Cc: | pgsql general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: solving wraparound |
| Date: | 2005-12-26 21:22:38 |
| Message-ID: | 20051226212238.GB19923@svana.org |
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| Lists: | pgsql-general |
On Mon, Dec 26, 2005 at 04:11:49PM -0500, Jaime Casanova wrote:
> yes, it seems that's enough...
>
> i was trying to help to a buddy in the spanish list and my first
> recommendation was to copy all data directory... when he tries that he
> makes a vacuum and the data go back...
>
> i told him to review their data to be sure...
For the record, the data dissappears from view after 2 billion
transactions but it's not until 3 billion that VACUUM considers the
data in the future and thus removable. VACUUM fixes it so it appears
again and all is well.
The only issue I can think of is that constraints might be violated
(duplicate keys in unique index) because one of the records might have
been invisible when the second was created...
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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