| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Fabrízio de Royes Mello <fabriziomello(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> |
| Subject: | Re: Re: [HACKERS] GSoC 2015 proposal: Improve the performance of “ALTER TABLE .. SET LOGGED / UNLOGGED” statement |
| Date: | 2015-07-09 13:56:21 |
| Message-ID: | 20150709135621.GZ10242@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2015-07-09 10:39:35 -0300, Fabrízio de Royes Mello wrote:
> If the "wal_level=minimal" we don't need to force the wal log of the
> contents. If the "wal_level != minimal" we need just to xlog all the pages,
> but in both cases we don't need the extra job to create a new datafiles and
> copy the contents between them. So we'll improve performance, or am I
> missing something?
Sure. It'll be a bit faster. I just don't see the peformance increase in
not that common situations being worth the price we'll pay in
development, code review, debugging and then maintaining some nontrivial
code. If this were likely to be a 15 line patch, I'd think differently.
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