多项选择题
A. FREE_SPACE indicates only the space that is currently unallocated.
B. ALLOCATED_SPACE indicates only the space currently allocated and in use.
C. FREE_SPACE indicates only the space that is currently allocated and available for reuse.
D. ALLOCATED_SPACE indicates both the space currently allocated and used，and the space that is available for reuse.
E. FREE_SPACE indicates both the space that is currently allocated and available for reuse，and the space that is currently unallocated.
单项选择题 our database instance is running. You are not able to access Oracle Enterprise Manager Database Control because the listener is not started.Which tool or utility would you use to start the listener?（）
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：（）