I prefer AWR mainly because it includes ASH (both assuming you have Enterprise Edition with the Diagnostics Pack license), which provides a much more detailed view of activity over the last hour, plus it's all nicely automated for you and comes with a nice GUI interface for quick/easy access. I downloaded spViewer once and it looks promising, but I never had time to test it out. Others that I've been planning to evaluate when I get the time are Lab128: http://www.lab128.com/lab128_home.html and ASHMON: http://perfvision.com/ashmon.php Regards, Brandon Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.