The ORDERS table belongs to the user OE. OE has granted the SELECT privilege on the ORDERS table to the user HR.Which statement would create a synonym ORD so that HR can execute the following query successfully?（）

A.when a DELETE statement is executed 
B.when a ROLLBACK command is executed 
C.when a PL/SQL anonymous block is executed 
D.when a data definition language (DDL) statement is executed 
E.when a TRUNCATE statement is executed after the pending transact ion

A.It can have a maximum of five expressions in a list 
B.It returns the highest NOT NULL value in the list for all rows 
C.It requires that all expressions in the list must be of the same data type 
D.It requires that at least one of the expressions in the list must have a NOT NULL value

A.RMAN will attempt to make the backup run as fast as possible without any IO limitations. 
B.RMAN will automatically restrict the number of channels in use to one. 
C.RMAN will spread the backup IO over the total duration stated in the backup command.
D.RMAN will skip any datafile that currently is involved in an IO operation. RMAN will retry backing up the datafile later and an error will be raised at the end of the backup if the datafile cannot be backed up. 
E.Datafiles will be backed up; those having the lowest current number of IO operations will be backed up first.