You notice a performance change in your production Oracle 12c database. You want to know
which change caused this performance difference.
Which method or feature should you use?
A.
Compare Period ADDM report
B.
AWR Compare Period report
C.
Active Session History (ASH) report
D.
Taking a new snapshot and comparing it with a preserved snapshot
Explanation:
The awrddrpt.sql report is the Automated Workload Repository Compare Period
Report. The awrddrpt.sql script is located in the $ORACLE_HOME/rdbms/admin directory.
Incorrect:
Not A: Compare Period ADDM
Use this report to perform a high-level comparison of one workload replay to its capture or to
another replay of the same capture. Only workload replays that contain at least 5 minutes of
database time can be compared using this report.
B
AWR Compare Periods report shows the difference between two periods (or two AWR reports, which equates to four snapshots). Using the AWR Compare Periods report helps you to identify detailed performance attributes and configuration settings that differ between two time periods.
B
why not A? it is albo used to compare 2 periods in terms of performance
B