Re: Nested transactions

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>
Cc: Barry Lind <blind(at)xythos(dot)com>, simon(at)2ndquadrant(dot)com, Patches <pgsql-patches(at)postgresql(dot)org>, alvherre(at)dcc(dot)uchile(dot)cl
Subject: Re: Nested transactions
Date: 2004-06-17 02:03:15
Message-ID: 200406170203.i5H23F801739@candle.pha.pa.us
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Christopher Kings-Lynne wrote:
> > And consider this case:
> >
> > BEGIN;
> > ...
> > SAVEPOINT x;
> > SELECT func_call();
> > SELECT func_call();
> > COMMIT;
> >
> > Now if func_call has a savepoint, it is really nested because it can't
> > know whether the savepoint X will be used to roll back, so its status is
> > dependent on the status of X. Now, if we used savepoints in func_call,
> > what happens in the second function call when we define a savepoint with
> > the same name? I assume we overwrite the original, but using nested
> > transaction syntax seems much clearer.
>
> It also seems in this example that func_call() probably shouldn't have
> permission to rollback to savepoint x? Otherwise it would get...weird.

Yes, weird.

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