V$TEMPSTAT

Columns
   ___________________________
 
   FILE#
   PHYRDS
   PHYWRTS
   PHYBLKRD
   PHYBLKWRT
   SINGLEBLKRDS
   READTIM
   WRITETIM
   SINGLEBLKRDTIM
   AVGIOTIM
   LSTIOTIM
   MINIOTIM
   MAXIORTM
   MAXIOWTM

Related:

V$FILESTAT - I/O Activity and times