Tom Lane escribió:
> I wrote:
> > Actually, if you wanted a low-hanging solution to that, it would
> > probably be to revert this 8.2 patch:
> >
> Uh ... never mind, that won't help at all.  Reducing the lock taken for
> ANALYZE could allow CREATE INDEX (ShareLock) to run concurrently.  But
> ALTER TABLE wants AccessExclusive lock, and no amount of fine-tuning of
> the conflicting lock will help.
> It might be possible to solve this if we reduce the strength of the lock
> used for ALTER TABLE.  We'd have to go through all the commands
> potentially issued by a pg_dump script and see if they could all be made
> to run concurrently with autovac, which is a bit nervous-making but
> might be feasible; and I'm afraid tablecmds.c would need some
> restructuring to not use the same lock type for every variant of ALTER.
> But it seems like a path worth investigating.

Right.  Are you going to work on it, or do you want me to propose a

Alvaro Herrera                      
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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