Process Monitor (PMON)
Watches over the user processes that access the database. If a user process terminates
abnormally, PMON is responsible for cleaning up any of the resources left
behind (such as memory) and for releasing any locks held by the failed process.
Archiver (ARCn)
Reads the redo log files once Oracle has filled them and writes a copy of the used
redo log files to the specified archive log destination(s).
Up to 10 Archiver processes are possible??”hence the notation ARCn. LGWR
will start additional Archivers as needed, based on the load, up to a limit specified
by the initialization parameter LOG_ARCHIVE_MAX_PROCESSES. By
default, this initialization parameter has a default value of 2 and is rarely
changed.
Checkpoint (CKPT)
Updates datafile headers whenever a checkpoint is performed.
Recover (RECO)
Automatically cleans up failed or suspended distributed transactions.
Dispatcher
Optional background processes used when shared server configurations are
deployed.
Global Cache Service (LMS)
Manages resources for Real Application Clusters and interinstance resource
control.
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