"Vladimir Kanazir" <[EMAIL PROTECTED]> writes: > If I execute this query: > alter table history add incoming_id bigint default 0;
> the table will be locked until operation finishes (checked by executing the > select query on the same table via another connection). Indeed, because it has to physically fill the value zero into every table row. > But, if I do this: > alter table history add incoming_id bigint; > alter table history alter incoming_id set default 0; > update history set incoming_id=0; > the table will be locked only during alter table execution, which is very > short time. But this exposes the state where incoming_id isn't zero to other transactions. regards, tom lane -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs