How do I obtain an AWR report for a certain time period?
First, you need to identify the AWR snapshots that cover your target time period. This can easily be done by going to the Enterprise Manager AWR Snapshots page. Command line users can query the DBA_HIST_SNAPSHOT view to identify the best set of AWR snapshots. An AWR report, for the pair of snapshots, can then be obtained using Enterprise Manager “View Report” feature or by executing the SQL*Plus AWRRPT.SQL script which can be found in the $ORACLE_HOME/rdbms/admin directory.