"Hiroshi Inoue" <Inoue@tpf.co.jp> writes:
>> That's a good point --- we acquire exclusive lock anyway on a table
>> about to be deleted, so just holding that lock till end of transaction
>> should prevent other backends from trying to touch the table.
> That reminds me.
> DROP TABLE doesn't hold exlusive lock till end of transaction.
> UnlockRelation() seems too early.
I wondered about that too --- but I didn't change it because I wasn't
sure it was wrong. Vadim, what do you think?
> Seems ALTER TABLE doesn't acquire any lock for the target
> relation. It's OK ?
None? Yipes. Seems to me it should *definitely* be grabbing
AccessExclusiveLock.
regards, tom lane