Hi, Oracle 1.1.06 RAC on OEL 4 64 bit. We are seeing an insert statement reporting "SQL*Net break/reset to client" as over 1/3 of its time. On the face of it this event suggests network issues but nothing else backs this up as the cause. So I looked at the Java code in question and a trace of one of the sessions. What is happening is that an attempt is made to insert a row, most of the time a duplicate error results, the code catches this exception and does an update. I was wondering if its the duplicate error and the exception handling which results in this wait event showing up. All insights welcome Regards Pete