| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Noah Misch <noah(at)leadboat(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: foreign key locks, 2nd attempt |
| Date: | 2012-03-15 21:07:28 |
| Message-ID: | CA+U5nM+gb_vBSCcWUwGxEtypV9v7h69zaA_3i1zZn0SrR5z8XQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Mar 14, 2012 at 5:23 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> You still have HEAP_XMAX_{INVALID,COMMITTED} to reduce the pressure on mxid
>> lookups, so I think something more sophisticated is needed to exercise that
>> cost. Not sure what.
>
> I don't think HEAP_XMAX_COMMITTED is much help, because committed !=
> all-visible.
So because committed does not equal all visible there will be
additional lookups on mxids? That's complete rubbish.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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