单项选择题 You want to set the following initialization parameters for your database instance: LOG_ARCHIVE_DEST_1 = LOCATION=/disk1/arch LOG_ARCHIVE_DEST_2 = LOCATION=/disk2/arch LOG_ARCHIVE_DEST_3 = LOACTION=/disk3/arch LOG_ARCHIVE_DEST_4 = LOCATION=/disk4/arch MANDATORY Identify the statement that correctly describes this setting.（）

单项选择题 Your system has been upgraded from Oracle Database 10g to Oracle Database 11g. You imported SQL Tuning Sets （STS） from the previous version. After changing the  OPTIMIZER_FEATURE_ENABLE parameter to 10.2.0.4 and running the SQL Performance Analyzer， you observed performance regression for a few SQL statements.  What would you do with these SQL statements？（）

单项选择题 A database instance is using an Automatic Storage Management (ASM) instance, which has a disk group, DGROUP1, created as follows: SQL> CREATE DISKGROUP dgroup1 NORMAL REDUNDANCY FAILGROUP controller1 DISK /devices/diska1, /devices/diska2 FAILGROUP controller2 DISK /devices/diskb1, /devices/diskb2 ; What happens when the whole CONTROLLER1 Failure group is damaged?（）