For comparing, classifying, benchmarking and forecasting databases, Oracle’s Automatic Workload Repository (AWR) is neat. (But remember! You will need a diagnostics pack license for that as described here and here – if you need a free technology for performance monitoring, consider using Craig Shallahamer’s OSM toolkit.)
If you need to create a snapshot manually, because you don’t like the one-hour interval, or if you disabled taking snapshots at all:
Create a report:
This script will ask you for the format of the report (html or plain text), the snapshot ID for start and end of the report (an overview of the last n day’s snapshots is given) and for a report name, that’s used for the report file name (.html or .lst).
Stay happy with your databases,