Oracle Instance Management - Processes
-(SMON) System Monitor : Crash recovery
-(PMON) Process Monitor : Clean up resources
-(DBWn) Database Writer : Write buffer cache to database file
-(CKPT) Write the latest checkpoint to data file header and control files
-(LGWR) Write the log buffers to redo log files on disc. In RAC, each RAC has its own
LGWR process
-(ARCH) Writes filled redo logs to archive log locations.
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