（16） 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

答案：（C）

解析：

1->检查点进程（CKPT）

2->系统监控进程（SMON）

3->系统监控进程（SMON）

4->进程监控进程（PMON）

5->进程监控进程（PMON）

6->进程监控进程（PMON）

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Oracle 11G OCP 1Z0-052 16