单项选择题 You are managing an Oracle Database 11g ASM instance with a disk group dg01 having three disks. One of the disks in the disk group becomes unavailable because of power failure. You issued the following command to change the DISK_REPAIR_TIME attribute from 3.6 hours to 5 hours：   ALTER DISKGROUP dg01 SET ATTRIBUTE ’disk_repair_time’ = ’5h’；   To which disks in the disk group will the new value be applicable？（）

多项选择题 Your database is running in ARCHIVELOG mode. One of the data files, USERDATA01.dbf, in the USERS tablespace is damaged and you need to recover the file until the point of failure. The backup for the datafile is available. Which three files would be used in the user-managed recovery process performed by the database administrator （）(DBA)? (Choose Three)

单项选择题 Evaluate the following command：   SQL>ALTER SYSTEM SET db_securefile = ’IGNORE’；   What is the impact of this setting on the usage of SecureFiles？（）