What is oracle process explain any four processes started, Ask an Expert

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What is Oracle Process? Explain any four processes started by Oracle.

Oracle Process is as follows:
SMON: The System Monitor carries out a crash recovery while a crashed instance is begin up again. It also cleans temporary segments.
PMON: The Process Monitor checks if a user procedure fails and if so, does all cleaning up of resources in which the user process has acquired.
DBWR : The Database Writer writes dirty blocks from the database buffer to the data files. How several DBWn Processes are begins is determined through the initialization parameter DB_WRITER_PROCESSES. DBWR also writes the actual SCN with the Block.
LGWR : The Log Writer writes the redo log buffer from the SGA to the online redo log file.

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