> I don't buy that argument even for foreign keys --- and remember that
> pg_constraint will also hold entries for CHECK, UNIQUE, and PRIMARY KEY
> constraints.  I don't want to have to take a global lock whenever we
> create an index.

I don't understand why a global lock is necessary -- and not simply a
lock on the pg_constraint table and the relations the constraint is
applied to (foreign key locks two, all others one).




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