单选题You created the DEPT table by using the following command：   CREATE TABLE scott.dept   （deptno NUMBER（3），   dname VARCHAR2（15），   loc VARCHAR2（15） ）   STORAGE （INITIAL 100K NEXT 50K  MAXEXTENTS 10 PCTINCREASE 5  FREELIST GROUPS 6 FREELISTS 4）；You are r

第1题：

You just issued the following statement: ALTER TABLE SALES DROP COLUMN PROFIT. Which of the following choices identifies when the column will actually be removed from Oracle?（）

• A、Immediately following statement execution 
• B、After the ALTER TABLE DROP UNUSED COLUMNS command is issued 
• C、After the ALTER TABLE SET UNUSED COLUMN command is issued 
• D、After the ALTER TABLE MODIFY command is issued

第2题：

You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which the view was created.) How do you obtain the definition of the view?（）

• A、Use the DESCRIBE command on the EMP_DEPT_VU view.
• B、Use the DEFINE VIEW command on the EMP_DEPT_VU view.
• C、Use the DESCRIBE VIEW command on the EMP_DEPT_VU view.
• D、Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.
• E、Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.
• F、Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.

第3题：

第4题：

On Monday， you dropped the DEPT table from your schema and then you re/x7fcreated the DEPT table in your schema. On Wednesday， you have a requirement to restore the DEPT table from the recycle bin. Which statement is correct？（）

• A、You can restore the DEPT table by using the Oracle Flashback Drop feature， provided you use the RENAME TO clause.
• B、You can restore the DEPT table by using the Oracle Flashback Drop feature and a system­generated name will be assigned to the restored table.
• C、You cannot restore the DEPT table by using the Oracle Flashback Drop feature because a table withthe name DEPT already exists in your schema.
• D、You cannot restore the DEPT table by using the Oracle Flashback Drop feature because the contents of the recycle bin are purged every 12 hours by default.

第5题：

Examine the following commands executed in your database： SQL> ALTER SESSION RECYCLEBIN=ON； Session altered  SQL > CREATE TABLE emp TABLESPACE tbsfd AS SELECT * FROM hr.employees；  Table created.  Further， you executed the following command to drop the table：  SQL> DROP TABLE emp；Table dropped.  What happens in this scenario？（）

• A、The table is moved to the SYSAUX tablespace.
• B、The table is moved to the SYSTEM tablespace.
• C、The table is removed from the database permanently.
• D、The table is renamed and remains in the TBSFD tablespace.

第6题：

You created the DEPT table by using the following command：   CREATE TABLE scott.dept   （deptno NUMBER（3），   dname VARCHAR2（15），   loc VARCHAR2（15） ）   STORAGE （INITIAL 100K NEXT 50K  MAXEXTENTS 10 PCTINCREASE 5  FREELIST GROUPS 6 FREELISTS 4）；You are required to shrink the DEPT table. While performing the shrink operation， you want to ensure that the recovered space is returned to the tablespace in which the DEPT table is stored. You do not want to shrink the indexes created on the DEPT table. What will you do to shrink the SCOTT.EMP table？（）

• A、 Issue the ALTER TABLE SCOTT.DEPT SHRINK SPACE COMPACT； statement.
• B、 Issue the ALTER TABLE SCOTT.DEPT SHRINK SPACE； statement.
• C、 Issue the ALTER TABLE SCOTT.DEPT SHRINK SPACE CASCADE； statement.
• D、 You cannot shrink the SCOTT.EMP table.

第7题：

You issued the following command to analyze the SCOTT.EMP table for block corruption：   ANALYZE TABLE SCOTT.EMP VALIDATE STRUCTURE；  You received the following error：   ORA-01578： ORACLE data block corrupted  （file # %s， block # %s）   How will you resolve the block corruption problem？（）

• A、 by using the DBMS_REPAIR package
• B、 by using the DB_BLOCK_CHECKING parameter
• C、 by using the DBVERIFY utility
• D、 will not be completely resolved until the hardware fault is corrected

第8题：

You are a Database Administrator with WonderWeb. You use a password file to establish connections to the Sales database located on the server. You created the password file using the following command：        ORAPWD file=d：/oracle/ora9i/orapwU01 password=admin entries=4   You erroneously deleted the password file while the database was running. You re-create the password file using the following command：   ORAPWD file=d：/oracle/ora9i/orapwU01 password=change_on_install entries=4   However， when you try to connect as the SYS user， you receive the following error：        ORA-01031： insufficient privileges   What should you do to resolve this error？（）

• A、 Delete the newly created password file and re-create another password file with the password admin， without shutting down the database.
• B、 Enable the operating system authentication， shut down the database， disable the operating system authentication， and restart the database using the password file.
• C、 Enable the operating system authentication， shut down the database， re-create the password file using the same ORAPWD command， and restart the database using the password file.
• D、 Delete the newly created password file， enable operating system authentication and shut down the database. Then， re-create another password file using the same ORAPWD command and restart the database using this password file.

第9题：

An index called ORD_CUSTNAME_IX has been created on the CUSTNAME column in the ORDERS table using the following command: SQL>CREATE INDEX ord_custname_ix ON orders(custname); The ORDERS table is frequently queried using the CUSTNAME column in the WHERE clause. You want to check the impact on the performance of the queries if the index is not available. You do not want the index to be dropped or rebuilt to perform this test.Which is the most efficient method of performing this task?（）

• A、disabling the index
• B、making the index invisible
• C、making the index unusable
• D、using the MONITORING USAGE clause for the index

第10题：

Note the output of the following query；   SQL> SELECT flashback_archieve_name， status FROM dba_flashback_archieve； FLASHBACK_ARCHIEVE_NAME STATUS FLA1   You executed the following command to enable Flashback Data Archive on the EXCHANGB_PATE table：   ALTER TABLE exchange_rate FLASHBACK ARCHIEVE；   What is the outcome of this command？（）  

• A、 The table uses the default Flashback Data Archive.
• B、 The Flashback Data Archive Is created In the SYSAUX tablespace.
• C、 The Flashback Data Archive is created in the same tablespace where the tables are stored.
• D、 The command generates an error because no flashback Data Archive name is specified and there is no default Flashback Data Achieve.