I think you need to specify that it was output of OraSRP (i googled it by "Session Flat Profile"). From readme of this tool (http://www.oracledba.ru/orasrp/README.html): There are some wait events called 'idle wait events' (or in terms of 10g and above, events from class 'Idle events'). It's such events like 'SQL*Net message from client' or 'SQL*Net message from dblink'. But in terms of OraSRP they are not always 'idle'. They are 'idle' when they happens 'between-call'. For example, the following 'SQL*Net message from client' is considered 'idle': Best regards, Sayan Malakshinov -- //www.freelists.org/webpage/oracle-l