P1 is the absolute file number for data files. (db_files parameter value) + temp_file# for temp files. I think we have mentioned this in our book. Sorry if that is missed. - Best Regards, K Gopalakrishnan Co-Author: Oracle Wait Interface, Oracle Press 2004 http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/ -- //www.freelists.org/webpage/oracle-l