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单选题
Note the following functionalities of various background processes： 1：Record the checkpoint information in data file headers. CKPT 2：Perform recovery at instance startup. SMON 3：Cleanup unused temporary segments. SMON 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
参考答案
参考解析
解析：
进程监视器进程(PMON) 在用户进程失败时执行进程恢复。PMON 负责清除数据库缓冲区高速缓存以及释放该用户进程使用的资源。例如，它重置活动事务处理表的状态，释放锁，并且从活动进程列表中删除该进程ID。PMON定期检查分派程序和服务器进程的状态，并重新启动任何已停止运行（但并非Oracle DB 故意终止）的分派程序和服务器进程。PMON 还将有关实例和分派程序进程的信息注册到网络监听程序。与SMON 一样，PMON 定期检查以查看是否需要执行；如果其它进程检测到需要该进程，也可以调用它。
更多 “单选题Note the following functionalities of various background processes： 1：Record the checkpoint information in data file headers. CKPT 2：Perform recovery at instance startup. SMON 3：Cleanup unused temporary segments. SMON 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， 2，5B System Monitor Process （SMON）：1，4，5C Process Monitor Process （PMON）：4，5，6D Database Writer Process （DBWn）：1，3，4” 相关考题
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