Explanation required for each attributes in dba_autotask_operation dictionary view.

 Is there any explanation in MOS for each attribute in dba_autotask_operation
SQL> select OPERATION_NAME,attributes from dba_autotask_operation;

OPERATION_NAME
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ATTRIBUTES
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auto optimizer stats job
ON BY DEFAULT, VOLATILE, SAFE TO KILL

auto space advisor job
ON BY DEFAULT, VOLATILE, SAFE TO KILL

automatic sql tuning task
ONCE PER WINDOW, ON BY DEFAULT, VOLATILE, SAFE TO KILL
 

Thanks