| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Robert Haas <robertmhaas(at)gmail(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: | 2015-03-12 09:41:08 |
| Message-ID: | 20150312094108.GA20199@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2015-03-11 20:55:18 -0400, Peter Eisentraut wrote:
> I don't think so. Andres basically wanted a nontrival algorithm to
> determine how much pruning to do during a read-only scan. And Robert
> basically said, that's not really possible.
I don't think either of us made really strong statements.
> We have seen some benchmarks that show significant improvements. We
> have seen some (constructed ones) that show problems.
FWIW, it's not that constructed. It's just a mixture of read with write
load.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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