Hi Gurus, Kindly clarify my doubt on datafile size. I have noticed that the datafile size is different from OS level vs database. When I query to get the size of SYSAUX tablespace on database it showed me 310 MB, But on OS it showed me 830M. SQL> select file_name,tablespace_name,bytes/1024/1024, maxbytes/1024/1024,AUTOEXTENSIBLE 2 from dba_data_files where tablespace_name='SYSAUX' order by file_name; FILE_NAME -------------------------------------------------------------------------------- TABLESPACE_NAME BYTES/1024/1024 MAXBYTES/1024/1024 AUT ------------------------------ --------------- ------------------ --- /DATA/ORACLE/datafiles/sysaux01.dbf SYSAUX 310 0 NO bash-3.00$ pwd /DATA/ORACLE/datafiles/ bash-3.00$ du -sh sysaux01.dbf 830M sysaux01.dbf bash-3.00$ How this is possible? Regards, Naga