Of course, versions 10 and were normal this support. but there are still plenty of them in production environments. Also many of these are migrated to version 11 or 12, but other many remain as historical. One feature I am observing that is becoming common and depending on license political to customer with Oracle is relative to ADDM. I have received requests to disable this feature / tool.
If you read the manual, it says to put off the ADDM must configure the STATISTICS_LEVEL to BASIC. Which is correct, but it is less clear or does not say that putting this parameter to BASIC, puts disable many other features of tuning that are free. This is put sticks in the wheels.
The solution specific to this version, the following versions this changes, is using a hidden parameter;
ALTER SYSTEM SET “_ADDM_AUTO_ENABLE”=FALSE;
HTH – Antonio NAVARRO