| From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Andres Freund <andres(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net>, "Hilbert, Sebastian" <Sebastian(dot)Hilbert(at)gmx(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [GENERAL] pg_upgrade ?deficiency |
| Date: | 2013-11-23 00:25:57 |
| Message-ID: | 1385166357.84476.YahooMailNeo@web162902.mail.bf1.yahoo.com |
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| Lists: | pgsql-general pgsql-hackers |
Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> On Fri, Nov 22, 2013 at 01:55:10PM -0800, Kevin Grittner wrote:
>
>> It does nothing about pg_upgrade, which is sort of a separate
>> issue. My inclination is that connections to the new cluster
>> should set this and connections to the old should not.
>
> It is going to be tricky to conditionally set/reset an
> environment variable for default_transaction_read_only for
> old/new clusters.
Why? If you know you have connected to the new cluster, set it to
off; if you know you have connected to the old cluster, don't touch
it.
> We never write to the old cluster, so I am not sure
> setting/resetting default_transaction_read_only is needed.
I'm sure it isn't. That's why I said that connections to the old
cluster should not set it -- by which I meant they should not do
anything with it.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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