Has any one seen (at least in Oracle10g) that the object# is -2 for certain CR blocks of an object and not the real object or data object number and knows why that is? The object in questions is a regular table and not a RBS (which have an obj# of -1). You can see this by querying x$bh and see the unsigned value -2 in x$bh. Anjo. -- //www.freelists.org/webpage/oracle-l