| From: | Stephen Frost <sfrost(at)snowman(dot)net> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Andres Freund <andres(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: removing PD_ALL_VISIBLE |
| Date: | 2013-05-31 20:49:09 |
| Message-ID: | 20130531204909.GY6434@tamriel.snowman.net |
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| Lists: | pgsql-hackers |
* Josh Berkus (josh(at)agliodbs(dot)com) wrote:
> On 05/31/2013 12:22 PM, Stephen Frost wrote:
> > Where I'm going with this whole thing is simply that I do worry a bit
> > about using a bitmap for freeze, or similar, information and not being
> > able to reconstruct that bitmap from the heap. Perhaps that's overly
> > paranoid, but, well, we also write the same data out to disk in multiple
> > places multiple times- some might call that paranoid too. ;)
>
> On the other hand, we could combine Heikki's proposal (epoch numbers in
> the page header) together with using the visibility map for pages we
> don't need to vacuum freeze, and get vastly better behavior without
> increasing corruption risk that I can see.
That was actually my thinking as well..
Thanks,
Stephen
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