MMON – This process performs various manageability-related background tasks, for example:
Issuing alerts whenever a given metrics violates its threshold value
Capturing statistics value for SQL objects which have been recently modified
MMNL - This process performs frequent and lightweight manageability-related tasks, such as session history capture and metrics computation.
MMAN - is used for internal database tasks that manage the automatic shared memory. MMAN serves as the SGA Memory Broker and coordinates the sizing of the memory components.
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