---

You are working on a database， where you have three redo log groups. When the database is down for a backup， an operating system （OS） user deletes all the redo log files in a group. What will happen when you open your database？（）
A: The instance starts， the database is mounted， but efforts to open the database fail， and an error about the missing redo log group is displayed.
B: Before the instance starts， you receive an error about the missing redo log files of a group.
C: The instance starts and the database opens with an error message written to the alert log file.
D: The instance starts and the database opens because two redo log groups still exist.
E: The instance starts and the database opens， but every attempt to write to redo log files fails with an error.

---

出自：Oracle认证

显示答案