I/O

select df.name 文件名,
       fs.phyrds 读次数,
       fs.phywrts 写次数,
       (fs.readtim / decode(fs.phyrds, 0, -1, fs.phyrds)) 读时间,
       (fs.writetim / decode(fs.phywrts, 0, -1, fs.phywrts)) 写时间
  from v$datafile df, v$filestat fs
 where df.file# = fs.file#
 order by df.name