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Re: pg_upgrade ?deficiency

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On Tue, Nov 19, 2013 at 11:22:47AM +0100, Karsten Hilbert wrote:
> 	ERROR:  transaction is read-only
> 
> Now, this is quite understandable since one of the databases
> is set to
> 
> 	ALTER DATABASE ... SET DEFAULT_TRANSACTION_READ_ONLY TO ON;
> 
> However, since the above setting is something which can
> be expected every so often in any odd PostgreSQL cluster
> (and not some weird coincidence no one really knows how
> they got into in the first place) I would think pg_upgrade
> really should be able to handle.
> 
> Technically that's pretty easy - make sure transactions are
> set to readwrite for the pg_upgrade run by any number of
> means:
> 
> 	- ALTER DATABASE before/after pg_upgrade
> 	- ALTER USER running the pg_upgrade
> 	- SET TRANSACTION READ WRITE at the appropriate times
> 	- ...
> 
> Or at least this limitation of pg_upgrade (requiring
> DB write access) should get a mention in the docs and/or
> man page.
> 
> What is the informed opinion on this ?

I think pg_upgrade did the right thing here by throwing an error.  There
is no clean way to handle these cases without possibly causing more
problems.

-- 
  Bruce Momjian  <bruce@xxxxxxxxxx>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + Everyone has their own god. +


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