| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | Andrew Sullivan <ajs(at)crankycanuck(dot)ca> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: 2PC-induced lockup |
| Date: | 2007-07-11 17:15:12 |
| Message-ID: | 46951020.9010606@enterprisedb.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Andrew Sullivan wrote:
> On Wed, Jul 11, 2007 at 04:44:12PM +0100, Heikki Linnakangas wrote:
>> FWIW, deleting the files from pg_twophase is safe when the system is
>> shut down.
>
> Is it safe for the PREPAREd TRANSACTIONs? I assume not. That is, in
> Peter's presumably experimental case, it might be ok to delete the
> files, but on a production system, you'd violate the semantics of 2PC
> by doing this?
It's effectively the same as manually issuing a ROLLBACK PREPARED. It
will brake the atomicity of the global transaction, if some branches of
that global transaction in other resource managers have already been
committed.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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