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1. Which two operations can be flashed back using the Flashback technology? (Choose two.)

A) DROP TABLESPACE USERS;
B) ALTER TABLE SALES_REP DROP PARTITION P1;
C) DROP USER SMITH;
D) DROP TABLE EMPLOYEES;
E) ALTER TABLE EMPLOYEES DROP COLUMN DESIG_ID;

2. Which two statements are true about the roles in the Oracle database? (Choose two.)

A) Roles can be granted to other roles.
B) A role can be granted to itself.
C) A role can contain both system and object privileges.
D) Roles are owned by the SYS user.
E) A role cannot be assigned external authentication.

3. Which two statements are true about the primary key constraint in a table? (Choose two.)

A) It is possible to have more than one primary key constraint in a single table.
B) It is not possible to disable the primary key constraint.
C) The non-deferrable primary key constraint creates an unique index on the primary key column if it is not already indexed.
D) The primary key constraint can be imposed by combining more than one column.
E) The primary key constraint can be referred by only one foreign key constraint.

4. Your database is running under automatic undo management and the UNDO_RETENTION parameter is set to 900 sec. You executed the following command to enable retention guarantee:
SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE;
What effect would this statement have on the database?

A) The extents which no longer contain uncommitted data in the undo tablespace are not overwritten for at least15 minutes.
B) The extents containing committed data in the undo tablespace are not overwritten until the instance is shut down.
C) The extents in undo tablespace retain data until the next full database backup.
D) The extents containing committed data in the undo tablespace are never overwritten.

5. Your database is open and users are connected using the LISTENER listener. The new DBA of the system stops the listener by using the following command:
LSNRCTL> STOP
What would happen to the sessions that are presently connected to the database instance?

A) The sessions are not affected and continue to function normally.
B) The sessions are not allowed to perform any operations till the listener is started.
C) The sessions are able to perform only queries.
D) The active transactions are rolled back and the sessions get terminated.

問題與答案：