What is the difference between SMON and PMON processes?

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SMON (System Monitor) performs recovery after instance failure, monitor temporary segments and extents; clean temp segment, coalesce free space. It is a compulsory process of DB and starts by default.

PMON (Process Monitor) failed process resources. In shared server architecture monitor and restarts any failed dispatcher or server process. It is a mandatory process of DB and starts by default.

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