I agree an hour is rather long - I take 15 minute snapshots instead (also from a script provided by Tim Gorman at evdbt.com), but it sounds like the OP is just trying to do trend analysis, not pinpoint a specific performance problem so I think what he's doing is probably okay for that. ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Dennis Williams What problem are you trying to resolve? Is there a performance problem? Hourly snapshots - keep in mind that a lot can occur in an hour. 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.