Re: Rewrite, normal execution vs. EXPLAIN ANALYZE

From: Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, David Fetter <david(at)fetter(dot)org>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Rewrite, normal execution vs. EXPLAIN ANALYZE
Date: 2010-07-23 21:48:25
Message-ID: 4C4A0E29.5050300@cs.helsinki.fi
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On 7/24/10 12:42 AM +0300, Kevin Grittner wrote:
> Alvaro Herrera<alvherre(at)commandprompt(dot)com> wrote:
>
>> In short I think a wCTE should only advance the CID, not get a
>> whole new snapshot.
>
> Even after unblocking from a write conflict at the READ COMMITTED
> isolation level?

I'm not sure what you mean by this; UPDATE and DELETE can take a look at
the new tuple but that's completely separate from the snapshot.

Regards,
Marko Tiikkaja

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