SELECT * FROM v$waitstat;

CLASS              COUNT      TIME      
------------------ ---------- ----------
data block                  0          0
sort block                  0          0
save undo block             0          0
segment header              0          0
save undo header            0          0
free list                   0          0
extent map                  0          0
bitmap block                0          0
bitmap index block          0          0
unused                      0          0
system undo header          0          0
system undo block           0          0
undo header                 0          0
undo block                  0          0