KTFBHC shows the Bitmap Header Control in KTF (Tablespace/File Management) and BFE is Bitmap Free Extents (crudely like FET$ in old DMT tablespaces). If you are looking for a true size (usable size) use the BHCUSZ (Usable Space?) and this excludes the header space, extent maps etc. -Gopla -- //www.freelists.org/webpage/oracle-l