For data/temp files, v$filestat and v$tempstat, for redo v$sysstat. As I recall, v$sysstat has totals for data files as well. At 12:54 PM 1/5/2005, ryan_gaffuri@xxxxxxxxxxx wrote: >If I look at the physical reads in v$sess_io I can see how many writes. Is >there anyway to estimate how many bytes are being written to disk? This >includes undo. We want to use this for capacity planning purposes. We >cannot look at increases in volume since this needs to encompass updates >and deletes. >-- >//www.freelists.org/webpage/oracle-l Andy Rivenes Email: arivenes@xxxxxxxx -- //www.freelists.org/webpage/oracle-l