You are definitely right, Brandon. By the way, it is very easy to understand all STATS$% tables and DBA_HIST% views and what information is stored in each one of them. After that it becomes very simple to write a set of scripts to calculate deltas between each snapshot between a begin/end date/time and plot these deltas in a timeline graphic, using your preferred spreadsheet software. I've been doing this for a while and these graphics really simplified my performance diagnostics work. Regards, Cerri 2008/1/11, Allen, Brandon <Brandon.Allen@xxxxxxxxxxx>: > > Andrew, the instances you've seen are normal. I think there is just some > confusion here about exactly what we're all trying to say so I'll try to > clarify: > > Yes, the statistics values stored in statspack and awr snapshots are > cumulative, however the values reported by spreport.sql and awrrpt.sql (or > by the "View Report" action under Snapshots in OEM) are the deltas > calculated as the difference between those cumulative values for the > specified begin and end snapshots. > > For example, at snap #1, we have accumulated 100 phyrds and at snap #10 we > have accumulated 1000 phyrds, so when we run spreport or awrrpt and specify > beginning snapshot #1 and end snapshot #10, it calculates the delta as > 1000-100=900 and reports that 900 phyrds occurred during the interval > between whatever time snapshots 1 and 10 were taken. > > Hopefully that makes sense and settles the issue so we can all get along now > and enjoy our weekend :-) > > Regards, > Brandon > ________________________________ > From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] > On Behalf Of Andrew Kerber > > well, unless I have run into 3 really strange instances, it looks like > cumulative values to me. Unless you can explain why the phyrds and phywrts > are higher for each snap than the previous one for every file in my > instance. > > > 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. -- //www.freelists.org/webpage/oracle-l