| From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: heap metapages |
| Date: | 2012-05-21 18:22:12 |
| Message-ID: | CAHyXU0yE4cUHKekem7CwGs7go42Ym1DG6v_uB8v2f=uQ0UqmJw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, May 21, 2012 at 12:56 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> At dinner on Friday night at PGCon, the end of the table that included
> Tom Lane, Stephen Frost, and myself got to talking about the idea of
> including some kind of metapage in every relation, including heap
> relations. At least some index relations already have something like
> this (cf _bt_initmetapage, _hash_metapinit). I believe that adding
> this for all relations, including heaps, would allow us to make
> improvements in several areas.
The first thing that jumps to mind is: why can't the metapage be
extended to span multiple pages if necessary? I've often wondered why
the visibility map isn't stored within the heap itself...
merlin
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