Hi, What does the v$mutex_sleep tell you? Tanel. _____ From: VIVEK_SHARMA [mailto:VIVEK_SHARMA@xxxxxxxxxxx] Sent: 16 November 2006 08:49 To: oracle-l; tanel.poder.003@xxxxxxx; kaygopal@xxxxxxxxx Subject: cursor: pin S - mutex Wait - in Benchmark Gopal, Tanel, Folks As part of a 2 node RAC performance benchmark, DB Server nodes are choking at 100% CPU Usage, when 3000 dedicated server sessions are doing OLTP transactions