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smon :system monitor performs instance recovery at instance startup in a multiple instances. Recovers other instances that have falied in cluster environment .It cleans up temporary segments that are no longer in use.Recovers dead transactions skipped during crash and instance recovery.Coalesce the free extents within the database, to make fre space continguous and easy to allocate.

Pmon :process monitor performs recovery when a user process fails.It is responsible for cleaning up the cache, freeing resources used by the processes.In the mts environment it checks on dispatcher and server processes, restarting them at times of failure.

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