| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Turning off HOT/Cleanup sometimes |
| Date: | 2015-04-15 07:37:45 |
| Message-ID: | CA+U5nM+yUvd-wfqVQQeTRkiqW5HHXPNhHq3zDDDYybkxZNWC7g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 14 April 2015 at 21:53, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> Peter commented previously that README.HOT should get an update. The
> relevant section seems to be "When can/should we prune or
> defragment?".
That's easy enough to change once we agree to commit.
> I wonder if it would be a useful heuristic to still prune pages if
> those pages are already dirty.
Useful for who? This is about responsibility. Why should someone
performing a large SELECT take the responsibility for cleaning pages?
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, RemoteDBA, Training & Services
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