select
  wait_class_id,                           -- WAIT_CLASS_ID NUMBER
  wait_class#,                             -- WAIT_CLASS# NUMBER
  wait_class,                              -- WAIT_CLASS VARCHAR2(64)
  total_waits,                             -- TOTAL_WAITS NUMBER
  time_waited,                             -- TIME_WAITED NUMBER
  total_waits_fg,                          -- TOTAL_WAITS_FG NUMBER
  time_waited_fg                           -- TIME_WAITED_FG NUMBER
from
  gv$system_wait_class
where
  inst_id = USERENV('Instance')