问题:
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
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()
● 参考解析
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。
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