| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>, Steve Singer <ssinger_pg(at)sympatico(dot)ca>, pgsql-hackers(at)postgresql(dot)org, Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Subject: | Re: Review: Fix snapshot taking inconsistencies |
| Date: | 2011-02-28 19:01:15 |
| Message-ID: | 27524.1298919675@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Mon, Feb 28, 2011 at 1:45 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> I'm afraid that the goals of this patch might be similarly obsolete.
> No, I don't think so. IIUC, the problem is that EXPLAIN ANALYZE runs
> the rewrite products with different snapshot handling than the regular
> execution path.
Possibly, but it's not clear to me that this patch fixes that.
As I said, it's no longer obvious what the patch means to do, and I'd
like a clear statement of that.
> So in theory you could turn on auto_explain and have
> the semantics of your queries change. That would be Bad.
That's just FUD. auto_explain doesn't run EXPLAIN ANALYZE.
regards, tom lane
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