V$SYSTEM_WAIT_CLASS
SQL> desc v$system_wait_class;
 Name                                                  Null?    Type
 ----------------------------------------------------- -------- ------------------------------------
 WAIT_CLASS_ID                                                  NUMBER
 WAIT_CLASS#                                                    NUMBER
 WAIT_CLASS                                                     VARCHAR2(64)
 TOTAL_WAITS                                                    NUMBER
 TIME_WAITED                                                    NUMBER
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