Show Disk File Operations

SET PAGESIZE 60
SET LINESIZE 300
COLUMN "File Type" for a20
COLUMN "File Operation" for a80

select
    decode(p3,0 ,'Other',
              1 ,'Control File',
              2 ,'Data File',
              3 ,'Log File',
              4 ,'Archive Log',
              6 ,'Temp File',
              9 ,'Data File Backup',
              10,'Data File Incremental Backup',
              11,'Archive Log Backup',
              12,'Data File Copy',
              17,'Flashback Log',
              18,'Data Pump Dump File',
                  'unknown '||p3)  "File Type",
    decode(p1,1 ,'file creation',
              2 ,'file open',
              3 ,'file resize',
              4 ,'file deletion',
              5 ,'file close',
              6 ,'wait for all aio requests to finish',
              7 ,'write verification',
              8 ,'wait for miscellaneous io (ftp, block dump, passwd file)',
              9 ,'read from snapshot files',
                 'unknown '||p1) "File Operation",
    decode(p3,2,-1,p2) file#,
    count(*)
from dba_hist_active_sess_history
where event ='Disk file operations I/O'
group by p1,p3,
    decode(p3,2,-1,p2)