From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
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To: | Bruce Momjian <bruce(at)momjian(dot)us> |
Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Daniel Farina <daniel(at)heroku(dot)com>, Greg Stark <stark(at)mit(dot)edu>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: pg_upgrade and statistics |
Date: | 2012-03-15 15:15:42 |
Message-ID: | 4F62079E.1@dunslane.net |
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Lists: | pgsql-hackers |
On 03/15/2012 11:03 AM, Bruce Momjian wrote:
> On Thu, Mar 15, 2012 at 08:22:24AM +0200, Peter Eisentraut wrote:
>> On ons, 2012-03-14 at 17:36 -0400, Bruce Momjian wrote:
>>> Well, I have not had to make major adjustments to pg_upgrade since 9.0,
>>> meaning the code is almost complete unchanged and does not require
>>> additional testing for each major release. If we go down the road of
>>> dumping stats, we will need to adjust for stats changes and test this to
>>> make sure we have made the proper adjustment for every major release.
>> I think this could be budgeted under keeping pg_dump backward
>> compatible. You have to do that anyway for each catalog change, and so
>> doing something extra for a pg_statistic change should be too shocking.
> Well, the big question is whether the community wants to buy into that
> workload. It isn't going to be possible for me to adjust the statistics
> dump/restore code based on the changes someone makes unless I can fully
> understand the changes by looking at the patch.
You're not the only person who could do that. I don't think this is all
down to you. It should just be understood that if the stats format is
changed, adjusting pg_upgrade needs to be part of the change. When we
modified how enums worked, we adjusted pg_upgrade at the same time. That
sort of thing seems totally reasonable to me.
I haven't looked at it, but I'm wondering how hard it is going to be in
practice?
cheers
andrew
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