Re: GetCurrentVirtualXIDs()

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Simon Riggs <simon(at)2ndQuadrant(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: GetCurrentVirtualXIDs()
Date: 2009-01-16 17:15:04
Message-ID: 7890.1232126104@sss.pgh.pa.us
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Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
> No need to wait for idle-in-transaction sessions during index builds.
> GetCurrentVirtualXIDs() specifically *includes* backends that have
> proc->xmin == InvalidTransactionId (0), but I'm not sure why.

Because they might be about to change xmin to something real?

regards, tom lane

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