| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Planning incompatibilities for Postgres 10.0 |
| Date: | 2013-05-29 03:50:15 |
| Message-ID: | 20130529035015.GA15045@eldon.alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Bruce Momjian wrote:
> On Mon, May 27, 2013 at 03:06:13PM -0400, Alvaro Herrera wrote:
> > Bruce Momjian wrote:
> > I would have each data segment be self-identifying, i.e. have a magic
> > number at the beginning of the file and the relation OID, some fork
> > identification and the segment number somewhere -- probably the special
> > space of the first page.
>
> Is this something we want on the TODO? I was not clear how to do with
> without making the first page format special or wasting space on all the
> other pages.
I don't think the special space has to necessarily be identically sized
in all the pages -- I admit I haven't looked closely, but the special
size is part of the page header.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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