AWR BASELINE setup and related

I have joined a new company and since there is no information available regarding the db performance in terms of peak load and off peak load , is there a way I can dig into the OEM ( AWR) reports to determine this. Or what are the other possibilities ? Some DBs run on Windows and some on unix.
Moving I want to set up repeated baseline ( after determining the peak and off peak times) to track system utilization / performance degradation over a period of time or due to change in application code or upgrade to the database. What is the best option to go forward do I generate a baseline for the entire peak period or off peak period ?.The idea is compare the baseline when the new changes are introduced.
Appreciate your response

Hi,
It sounds like you already know what to do? Capturing a baseline is a good idea, but what the definition of peak and off-peak are will depend on your specific application. It will be different at each company. If you keep all of the snapshots for a known good day then you will be able to pick and choose which ones you use for a comparison?
Personally, I prefer to keep as much as possible. At least 6 months and 1 year if I can. It doesn't take up much space on my DBs in PROD. Somewhere between 5GB and 10GB depending on how active the DBs are. Well worth it in my opinion when you need to look at historical data because performance has changed. We are making changes quite a lot though.
You can then run the comparison reports and compare to your baseline each week or after any change, etc.
Hope that helps,
Rob

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