] > Kevin Kempter <cs_...@consistentstate.com> writes: > > we have a few not null constraints we want to drop on very large tables. > > Unfortunately the drop's are taking hours. Is there a way to drop a not > > null constraint via the system catalogs? > > Dropping a NOT NULL constraint is a trivial operation. The problem is > probably that you are blocked waiting to get a lock on the table. > Look for idle-in-transaction sessions that are holding locks on the > target table. > > regards, tom lane
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