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單項(xiàng)選擇題

Note the following functionalities of various background processes:
1. Record the checkpoint information in data file headers.
2. Perform recovery at instance startup.
3. Cleanup unused temporary segments.
4. Free the resources used by a user process when it fails.
5. Dynamically register database services with listeners.
6. Monitor sessions for idle session timeout.
Which option has the correct functionalities listed for a background process()

A.Archiver Process (ARCn): 1, 2, 5
B.System Monitor Process (SMON): 1, 4, 5
C.Process Monitor Process (PMON): 4, 5, 6
D.Database Writer Process (DBWn): 1, 3, 4

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