| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Thom Brown <thom(at)linux(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Fabrízio Mello <fabriziomello(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Error with index on unlogged table |
| Date: | 2015-12-09 07:41:40 |
| Message-ID: | 20151209074140.GH28762@awork2.anarazel.de |
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| Thread: | |
| Lists: | pgsql-hackers |
On 2015-12-09 16:30:47 +0900, Michael Paquier wrote:
> > I'm kinda wondering if it wouldn't have been better to go through shared
> > buffers in ResetUnloggedRelationsInDbspaceDir() instead of using
> > copy_file().
>
> For deployment with large shared_buffers settings, wouldn't that be
> actually more costly than the current way of doing? We would need to
> go through all the buffers at least once and look for the INIT_FORKNUM
> present to flush them.
We could just check the file sizes on disk, and the check for the
contents of all the pages for each file.
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