| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Kevin Grittner <kevin(dot)grittner(at)wicourts(dot)gov>, david <david(at)fetter(dot)org>, aidan <aidan(at)highrise(dot)ca>, stark <stark(at)mit(dot)edu>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 16-bit page checksums for 9.2 |
| Date: | 2012-02-29 19:30:56 |
| Message-ID: | CA+TgmoY2jPQk-Fi4TFBbQDEib6QXt4yn6pW3ZE_aerzBWs9vDw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Feb 29, 2012 at 2:18 PM, Alvaro Herrera
<alvherre(at)commandprompt(dot)com> wrote:
> Note that if we want such an utility to walk and transform pages, we
> probably need a marker in the catalogs somewhere so that pg_upgrade can
> make sure that it was done in all candidate tables -- which is something
> that we should get in 9.2 so that it can be used in 9.3. Such a marker
> would also allow us get rid of HEAP_MOVED_IN and HEAP_MOVED_OUT.
Getting rid of HEAP_MOVED_IN and HEAP_MOVED_OUT would be really nice,
but I don't see why we need to squeeze anything into 9.2 for any of
this. pg_upgrade can certainly handle the addition of a new pg_class
column, and can arrange for in-place upgrades from pre-9.3 versions to
9.3 to set the flag to the appropriate value.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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