OCP-1Z0-052-V9.02-116题

116.Your database is in shutdown state.  
What will happend if you issue next command:  
SQL> startup  
A. instance will started  
B. instance started and DB is mounted  
C. instance started, DB opened and finally mounted  
D. instance started, DB mounted and finally opened  
Answer: D  
答案解析:


A database goes through the following phases when it proceeds from a shutdown state to an open database state:

  1. Instance started without mounting database

    The instance is started, but is not yet associated with a database.


  2. Database mounted

    The instance is started and is associated with a database by reading its control file (see "Overview of Control Files"). The database is closed to users.


  3. Database open

    The instance is started and is associated with an open database. The data contained in the data files is accessible to authorized users.


     

原文地址:https://www.cnblogs.com/hzcya1995/p/13316287.html