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单项选择题 Note the functionalities of various background processes:  1:Perform recovery at instance startup. SMON  2:Free the resources used by a user process when it fails. PMON  3:Cleanup the database buffer cache when a process fails. PMON  4:Dynamically register database services with listeners. PMON  5:Monitor sessions for idle session timeout. PMON  6:Cleanup unused temporary segments. SMON  7:Record the checkpoint information in control file. CKPT  Which option has the correct functionalities listed for a background process()

A、Checkpoint (CKPT): 1, 2, 5

B、System Monitor (SMON): 1, 6

C、Process Monitor (PMON): 4, 6, 7

D、Database Writer (DBWR): 1, 3, 4

  • B
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