- enq: HW - contention
- enq: TX - row lock contention
- enq: WF - contention
- log file switch
- log file sync
- log file parallel write
- db file parallel write
- gc current/cr block 2-way/3-way
--查看事件描述 SELECT eq_name "Enqueue", ev.name "Enqueue Type", eq.req_description "Description" FROM v$enqueue_statistics eq, v$event_name ev WHERE eq.event# = ev.event# AND ev.name LIKE '%TX%row lock%' ORDER BY ev.name;