单选题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 w
题目
单选题
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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