Re: ALTER TABLE SET STATISTICS requires AccessExclusiveLock

Tom Lane wrote:
> Peter Eisentraut <peter_e@gmx.net> writes:
> > Is there a good reason for $subject, other than that the code is entangled 
> > with other ALTER TABLE code?
> 
> I think it could be lower, but it would take nontrivial restructuring of
> the ALTER TABLE support.  In particular, consider what happens when you
> have a list of subcommands that don't all require the same lock level.
> I think you'd need to scan the list and find the highest required lock
> level before starting ...

IIRC there was a patch from Simon to address this issue, but it had some
holes which he didn't have time to close, so it sank.  Maybe this can be
resurrected and fixed.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.