"Ed L." <pgsql(at)bluepolka(dot)net> writes:
> I need to convert an existing unique index on a very heavily inserted table
> into a primary key. Alter table works, but locks the table for too long.
> As a hack, can I just set pg_index.indisprimary = 't' and
> pg_constraint.contype = 'p' for the appropriate row in each? This is for
> 7.4.6 and 8.0beta3...
Don't forget to make the underlying columns notnull, too.
regards, tom lane