Simon Riggs wrote:
> On Fri, 2008-03-28 at 10:35 -0300, Alvaro Herrera wrote:
> > The problem is that we always consider every transaction's PGPROC->xid
> > in calculating MyProc->xmin. So if you have a long running
> > transaction, it doesn't matter how far beyond the snapshots are -- the
> > value returned by GetOldestXmin will always be at most the old
> > transaction's Xid. Even if that transaction cannot see the old rows
> > because all of its snapshots are way in the future.
> It may not have a TransactionId yet.
How is this a problen? If it ever gets one, it will be in the future.
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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