A. Health Monitor checks can be used to scan the contents of the redo log and archive logs for accessibility and corruption.
B. Health Monitor checks can be used to verify the integrity of database files and report failures if these files are inaccessible，corrupt or inconsistent.
C. Health Monitor checks can be used to verify the contents of dictionary entries for each dictionary object and fix it automatically.
D. Health Monitor checks are always initiated manually when there is some critical error.

A.Close all sessions performing queries using database links
B.running the database in shared server mode
C.The database on which the workload is replayed has to be a restore of the original database to a specific SCN
D.setting up the directory to capture the workload