How to find out peak workload and peak workload hours ?

We have recieved a query from client.
they want us to tell them peak work load (volume of data database manage at peak work load hours).
now the question is how to find out peak workload and peak workload hour in live prod database?
i do not think AWR report will give any clue on this even if when extract it for the hours when my database is into some daily planned activity with lots of transactions.
share your findings? thanks

The OEM portal allows you to view performance data in a chart over time, based on data in the AWR tables. If you don't have OEM configured, then you can select directly from the tables and sum by snap. Or if you are collecting data at OS level, (SAR etc) then use that.
If they are just interested in data changes, then you could just select FIRST_TIME, blocks *block_size from v$archived_log and break it down by hour etc.

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