STATISTICS_LEVEL
Set this parameters to TYPICAL(default) or ALL to enable statistics gathering by AWR.Setting STATISTICS_LEVEL to BASIC disables many database features,including AWR ,and is not recommended.
CONTROL_MANAGEMENT_PACK_ACCESS
Set to DIAGNOSTIC+TUNING (default) or DIAGNOSTIC to enable automatic database diagnostic monitoring.Setting CONTROL_MANAGEMENT_PACK_ACCESS to NONE disables many database features,including ADDM,and is strongly discouraged.