Hi All, A datafile (temp file of precise tool) has been deleted from os lelel without dropping from database. When I query the dba_temp_files it is showing: ERROR at line 1: ORA-01157: cannot identify/lock data file 607 - see DBWR trace file ORA-01110: data file 607: '/bio/u01/precise_i3_orcl_or_tmp_01.dbf' where as when I query v$tempfile, it is showing the file names properly without any error. Can someone explain me what is this strage behaviour. Thanks , Raj --------------------------------- Yahoo! Music Unlimited - Access over 1 million songs. Try it free.