Allen, Try "Hammerora" by Steve Shaw.. the coauthor of Pro Oracle Database 10g RAC on Linux.. It has a Linux and Windows version... http://hammerora.sourceforge.net It's based on TCL, an example would be tracing just a session or could be instance wide. Then from Hammerora, you'll feed the 10046 trace then it will create a replay file. Then you could thinker with the # of sessions, think time, etc. Then if you know TCL you could do custom scripts or scenarios.. - Karl Arao http://karlarao.wordpress.com -- //www.freelists.org/webpage/oracle-l