多选题After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then execute a command to open the database： SQL> ALTER DATABASE OPEN； Which two statements are true（）AThe online redo log files and online data fil
题目
多选题
After performing a clean shut down of the database instance for maintenance， you mount thedatabase and then execute a command to open the database： SQL> ALTER DATABASE OPEN； Which two statements are true（）
A
The online redo log files and online data files are opened.
B
All the online data file headers are checked for consistency.
C
Instance recovery is performed before opening the database.
D
The path and existence of all the log file members are checked