We are experiencing so much "async disk IO" wait event as below. What could be wrong? Do I have to look at any init parameters? SQL> select inst_id,SECONDS_IN_WAIT,sid,event from gv$session_wait where EVENT='async disk IO'; INST_ID SECONDS_IN_WAIT SID EVENT ---------- --------------- ---------- ------------------------------ 1 186185 2 async disk IO 3 186183 2 async disk IO 2 186184 2 async disk IO