Process Architecture

• Can be divided into 3 parts :

• 1) Required :

• - DBWR : Writes modified blocks from buffers to disk

• - LGWR : Writes accumulated redo log buffers to a log file. Write is triggered when buffer pool is 1/3rd full or at commit.

• - PMON (Process Monitor) : Cleans up after process failures or disconnections. It releases the locks, rollbacks the changes made,etc. PMON connects to orphaned servers to do this. But mostly it is idle.

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