| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Pg Patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: Snapshot management, final |
| Date: | 2008-04-23 12:21:06 |
| Message-ID: | 20080423122106.GA4768@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-patches |
Simon Riggs wrote:
> On Tue, 2008-04-22 at 18:13 -0400, Alvaro Herrera wrote:
> > Simon Riggs wrote:
> >
> > > OK, so it can;t be copied to a longer lived memory context?
> >
> > If you need that ability, please explain.
>
> No, I wish to prevent that, not enable it.
I see. Sure, we don't have that problem. In fact, we didn't have it
before either, so I'm not sure I see your point :-)
> Perhaps put the TransactionId on each snapshot and then an Assert can
> check it before its used.
There's no need for that -- all snapshots go away at transaction end.
An attempt to use one would cause a prompt crash (at least on an
assert-enabled build.)
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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