| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Pierre Frédéric Caillaud <lists(at)peufeu(dot)com> |
| Cc: | Greg Stark <gsstark(at)mit(dot)edu>, Sam Mason <sam(at)samason(dot)me(dot)uk>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Table and Index compression |
| Date: | 2009-08-07 17:28:49 |
| Message-ID: | 4A7C6451.9000707@agliodbs.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Pierre,
> I added a field in PageHeader which contains :
> - 0 to indicate a non-compressed page
> - length of compressed data if compressed
>
> If compression gains nothing (ie gains less than 4K), the page is
> stored raw.
>
> It seems that only pages having a PageHeader are handled by md.c, so
> it should work (am I mistaken ?)
Well, there's the issue of upgradability; this would require us to have
an incompatible upgrade of on-disk formats. So we don't want to go
further down this route unless we're sure it's worthwhile.
--
Josh Berkus
PostgreSQL Experts Inc.
www.pgexperts.com
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