There's a number of exclusions if memory serves (a trace reveals them) besides SUMDELTA$ DR$ tables DR# tables materialised view logs the latter of which (may) make enough sense since it would dynamically sampled at mview refresh time. -- Connor McDonald =========================== email: connor_mcdonald@xxxxxxxxx web: http://www.oracledba.co.uk "Semper in excremento, sole profundum qui variat"