多项选择题 Which three statements must be true before transporting a tablespace from a database on one platform to a database on another platform?（） (Choose three.)

单项选择题 You want the ability to recovery any time within the last seven days and therefore you configured the recovery window retention policy using the command：   RMAN> CONFIGURE RETENTIOH POLICY TO RKCOVFRY WINDOW OF 7 DAYS；   After configuring the recovery window， you performed the database backup as follows：（）

单项选择题 Which mode of database shutdown requires an instance recovery at the time of the next database startup?（）