Натолкнулся на:
"This release introduces a new LAST COMMITTED keyword option to the
SET ISOLATION COMMITTED READ statement to reduce the risk of locking conflicts when attempting to read a table. This new syntax instructs IDS to return the most recently committed version of the rows, even if another concurrent session holds an exclusive row-level lock."

Имхо, правильная фича, нам бы в DB2 LUW такую :)