Compare AWR reports easily.
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I have seen feature in OEM to compare two awr reports and today found a sql and functions for it AWR_DIFF_REPORT_HTML/ AWR_DIFF_REPORT_TEXT.
I ran in a windows 7, oracle 188.8.131.52 database.
The script is @?/rdbms/admin/awrddrpt. It will confirm two dbids and 4 snaps. easier to compare two reports.
Snap of a sample report.