多项选择题 You lost the index tablespace in your database. You decided to re­create the index tablespace and the indexes in the tablespace.  What methods can you use to re­create the indexes？（）

单项选择题 Youlosttheindextablespaceinyourdatabase.Youarenotabletousetablespacepoint­in­timerecoveryontheindextablespace.Whatcouldbethereasonforthis？（）

单项选择题 In your database， online redo log files are multiplexed and one of the members in a group is lost due to media failure.  How would you recover the lost redo log member？（）