| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> |
| Cc: | Dennis Bjorklund <db(at)zigo(dot)dhs(dot)org>, Pavel Stehule <stehule(at)kix(dot)fsv(dot)cvut(dot)cz>, Zeugswetter Andreas SB SD <ZeugswetterA(at)spardat(dot)at>, Andreas Pflug <pgadmin(at)pse-consulting(dot)de>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Nested Transactions, Abort All |
| Date: | 2004-07-09 20:07:19 |
| Message-ID: | 200407092007.i69K7Lu02465@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Alvaro Herrera wrote:
> On Fri, Jul 09, 2004 at 03:34:47PM -0400, Bruce Momjian wrote:
> > Alvaro Herrera wrote:
> > > On Fri, Jul 09, 2004 at 09:07:58PM +0200, Dennis Bjorklund wrote:
> > > > On Fri, 9 Jul 2004, Alvaro Herrera wrote:
> > > >
> > > > > Clearly savepoints do not allow for a snapshot to be released; nested
> > > > > xacts do.
> > > >
> > > > Why not?
> > >
> > > What is it?
> >
> > Simon posted it. It is called RELEASE:
>
> We can't actually release anything (commit the subtransactions), because
> they may be savepoints established after that point, and they are
> logically "inside" the previously established ones. At RELEASE we can't
> really release -- we just lose the name and thus the opportunity to
> rollback to it.
Oh, good point. Yes, those savepoints in between are still active. But
do we release anything on subxact commit? I though it was only on xact
abort, and that does invalidate all the savepoints in between.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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