单选题You executed this command to create a temporary table：  SQL> CREATE GLOBAL TEMPORARY TABLE report_work_area （startdate DATE， enddate DATE， class CHAR（20））ON COMMIT PRESERVE ROWS；  Which statement is true about the rows inserted into the REPORT_WORK_ARE

第1题：

You are responsible for a data warehouse application that uses records from an external table to update one of the dimension tables periodically. The records in the external table may contain data for new rows in the dimension table， or for updates to its existing rows. Which type of SQL command would you use to transfer the data from the external table to the dimension table as efficiently as possible？（）

• A、MERGE
• B、SELECT …CROSS JOIN
• C、INSERT ALL …SELECT
• D、CREATE VIEW …CONSTRAINT

第2题：

Evaluate the SQL statement:TRUNCATE TABLE DEPT;Which three are true about the SQL statement? （）

• A、It releases the storage space used by the table.
• B、It does not release the storage space used by the table.
• C、You can roll back the deletion of rows after the statement executes.
• D、You can NOT roll back the deletion of rows after the statement executes.
• E、An attempt to use DESCRIBE on the DEPT table after the TRUNCATE statement executes will display an error.
• F、You must be the owner of the table or have DELETE ANY TABLE system privileges to truncate the DEPT table

第3题：

Examine the command that is used to create a table：  SQL> CREATE TABLE orders（oid NUMBER（6） PRIMARY KEY， odate DATE， ccode NUMBER（6）， oamt NUMBER（10，2）） TABLESPACE users；  Which two statements are true about the effect of the above command） （）

• A、A CHECK constraint is created on the OID column.
• B、A NOT NULL constraint is created on the OID column.
• C、The ORDERS table is the only object created in the USERS tablespace.
• D、The ORDERS table and a unique index are created in the USERS tablespace.
• E、The ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.

第4题：

Examine the commands executed in the following sequence：  1：SQL> CREATE ROLE mgrrole；  2：SQL> GRANT create user，select any table，connect，resource TO mgrrole；  3：SQL> GRANT select，update ON sh.sales TO mgrrole；  4：SQL> CREATE ROLE ceo IDENTIFIED BY boss；  5：SQL> GRANT mgrrole，drop any table，create any directory TO ceo；  6：SQL> GRANT ceo TO mgrrole；  Which statement is true about the above commands（）

• A、The commands execute successfully.
• B、Command 6 produces an error because of circular role grant.
• C、Command 5 produces an error because a role cannot be granted to another role.
• D、Command 3 produces an error because the MGRROLE role already contains system privileges.
• E、The table created by HR remains and HR still has the CREATE TABLE system privilege.
• F、The table created by HR remains and HR can grant the CREATE TABLE system privilege to other users.

第5题：

You created the ORDERS table in your database by using the following code：   SQL> CREATE TABLE ORDERS （ORDER_DATE TIMESTAMP（0） WITH TIME ZONE）；   Then， you inserted data in the ORDERS table and saved it by issuing the following statements：SQL> INSERT INTO ORDERS VALUES（’18-AUG-00 10：26：44 PM America/New_York’）；   SQL> INSERT INTO ORDERS VALUES（’23-AUG-02 12：46：34 PM America/New_York’）；   SQL> COMMIT；   Next， you issued the following statement to change the time zone for the database：   SQL> ALTER DATABASE SET TIME_ZONE=’Europe/London’；   What will be the result of executing the above statement？（）  

• A、 The statement will fail.
• B、 The statement will be executed successfully， and the new time zone will be set for the database.
• C、 The statement will be executed successfully， but the new time zone will be set for the current session.
• D、The statement will be executed successfully， but the new time zone will neither be set for the database nor for a specific session.

第6题：

You issued the following command：   CREATE GLOBAL TEMPORARY TABLE admin_work_area   （startdate DATE， enddate DATE， class CHAR（20）） ON COMMIT DELETE ROWS TABLESPACE tbs_t1；   An index is then created on the ADMIN_WORK_AREA temporary table.  Which two statements are true regarding the TBS_T1 tablespace in the above command？（） 

• A、 It stores only the temporary table but not its indexes.
• B、 It stores both the temporary table as well as its indexes.
• C、 It must be a nondefault temporary tablespace for the database.
• D、 It can be a default or nondefault temporary tablespace for the database.
• E、 It must be the default temporary tablespace of the user who issues the command.

第7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

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第13题：

Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）

• A、Because row IDs may change during the flashback operation
• B、Because the object number changes after the flashback operation
• C、Because the rows are retrieved from the recycle bin during the flashback operation
• D、Because the table is moved forward and back to a temporary during the flashback opertion

第14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.

第15题：

You executed this command to create a temporary table：  SQL> CREATE GLOBAL TEMPORARY TABLE report_work_area （startdate DATE， enddate DATE， class CHAR（20））ON COMMIT PRESERVE ROWS；  Which statement is true about the rows inserted into the REPORT_WORK_AREA table during atransaction （）

• A、The rows stay in the table only until session termination.
• B、The rows stay in the table only until the next transaction starts on the table.
• C、The rows are visible to all current sessions after the transaction is committed.
• D、The rows stay available for subsequent sessions after the transaction is committed

第16题：

You create a table in your database that contains 50，000 rows approximately. The queries performed on the table are complex and performed on the table frequently. Which advisor helps you achieve the best performance of database for queries by recommending the appropriate indexes？（）  

• A、SQL Access Advisor
• B、 Memory Advisor
• C、SQL Tuning Advisor
• D、 Segment Advisor

第17题：

While creating a database using Database Configuration Assistant tool， you created a database default temporary tablespace. Which activity would cause the default temporary tablespace of the database to be used？（）

• A、the CREATE TABLE .. command
• B、sorting of the SYSTEM tablespace’s data
• C、sorting of data required by recursive SQL statements
• D、the CREATE TABLE .. ORGANIZATION EXTERNAL .. command
• E、sorting of data if the users have not been allocated temporary tablespace explicitly
• F、sorting of data if the users have been allocated temporary tablespace explicitly

第18题：

User A executes the following command to drop a large table in your database：SQL> DROP TABLE trans； While the drop table operation is in progress， user B executes the following command on the same table：SQL> DELETE FROM trans WHERE tr_type=’SL’； Which statement is true regarding the DELETE command（）

• A、It fails to delete the records because the records are locked in SHARE mode.
• B、It deletes the rows successfully because the table is locked in SHARE mode
• C、It fails to delete the records because the table is locked in EXCLUSIVE mode.
• D、It deletes the rows successfully because the table is locked in SHARE ROW EXCLUSIVE mode.

第19题：

You executed this command to create a temporary table： SQL> CREATE GLOBAL TEMPORARY TABLE report_work_area （startdate DATE， enddateDATE， class CHAR（20）） ON COMMIT PRESERVE ROWS； Which statement is true about the rows inserted into the REPORT_WORK_AREA table during a transaction（）

• A、The rows stay in the table only until session termination.
• B、The rows stay in the table only until the next transaction starts on the table.
• C、The rows are visible to all current sessions after the transaction is committed.
• D、The rows stay available for subsequent sessions after the transaction is committed

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