From: | "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM> |
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To: | "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-hackers(at)postgreSQL(dot)org |
Subject: | RE: Another little xlog change idea |
Date: | 2001-03-13 18:25:41 |
Message-ID: | 8F4C99C66D04D4118F580090272A7A234D331A@sectorbase1.sectorbase.com |
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Lists: | pgsql-hackers |
> As long as I'm about to change the xlog page headers, I have another
> little idea. Wouldn't it be a good idea to allow three backup pages
> per xlog record, not only two? It seems like three pages would be
> a natural requirement for logging operations like index page splits.
On index splits we don't backup left and right whole pages - just part
of pages filled by index tuples. This saves us ~ 8K for indices with
small keys.
> We could support as many as four pages per record, but that would mean
> having no free global bits in the info byte, which might be a
> bad idea. I think three page bits and one free bit is a good compromise.
> Thoughts?
You almost forget that we are in beta and should fix bugs, not implement
features which useless in current version -:) Add comments and that will
be enough, no?
Vadim
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