A.Add the user， SYSTEM， to the schemas option.B.Add the……

多项选择题Which two operations can be performed on an external table（）

A.Create a view on the table.
B.Create an index on the table.
C.Create a synonym on the table.
D.Add a virtual column to the table.
E.Update the table using the UPDATE statement.
F.Delete rows in the table using the DELETE command

单项选择题Your database is configured in shared server mode. However， your senior DBA asks you to modify the value ofthe PRIVATE_SGA limit in the profile of the users.  What could be the reason for this（）

A.To limit the User Global Area （UGA） memory allocated to a session from the SGA
B.To limit the amount of memory to be used for the dispatcher queue of a session in SGA
C.To limit the amount of memory to be used for the request pool in System Global Area （SGA）
D.To control the amount of memory allocated in SGA for the local variables for each shared server process

多项选择题Whichtwostatementscorrectlydescribetherelationbetweenadatafileandthelogicaldatabasestructures（）

A.An extent cannot spread across data files.
B.A segment cannot spread across data files.
C.A data file can belong to only one tablespace.
D.A data file can have only one segment created in it.
E.A data block can spread across multiple data files as it can consist of multiple operating system （OS）blocks

多项选择题A constraint in a table is defined with the INITIALLY IMMEDIATE clause. You executed the ALTER TABLEcommand with the ENABLE VALIDATE option to enable the constraint that was disabled.  What are the twoeffects of this command（）

A.It fails if any existing row violates the constraint.
B.It does not validate the existing data in the table.
C.It enables the constraint to be enforced at the end of each transaction.
D.It prevents insert， update， and delete operations on the table while the constraint is in the process of beingenabled

多项选择题You executed the following command to create a tablespace called SALES_DATA： SQL> CREATE TABLESPACE sales_data DATAFILE SIZE 100M SEGMENT SPACE MANAGEMENT AUTO； Which two statements are true about the SALES_DATA tablespace（）

A.The database automatically determines the extent-sizing policy for the tablespace.
B.The segments are automatically shrunk when the contents are removed from them.
C.The allocation of extents within the tablespace is managed through the dictionary tables.
D.The space utilization description of the data blocks in segments is recorded in bitmap blocks.
E.The space utilization description of the data blocks in segments is managed through free lists.