Data File

SELECT owner || '.' || object_name, SUM (VALUE)
FROM v$segment_statistics
WHERE statistic_name IN ('physical reads', 'physical writes')
AND tablespace_name NOT IN ('SYSTEM', 'SYSAUX')
GROUP BY owner || '.' || object_name
ORDER BY 2 DESC;
-----------------------------
SELECT name "Datafile", phyrds "Okuma", phywrts "Yazma", phyrds + phywrts "Toplam IO" FROM V$DATAFILE, V$FILESTAT WHERE V$DATAFILE.file# = V$FILESTAT.file#;


http://www.gokhanatil.com/oracle-datafile-veri-dosyalari-istatistikleri/