多选题Your database instance is running with full workload after database creation. You have decided to use a fixed-size undo tablespace. You want to use the Undo Advisor to estimate the capacity of the undo tablespace. Which two factors must you consider be

第1题：

You are maintaining the SALES database for eSoft Corporation. You have not configured ASMM on the database. You want to know what size of the SGA will provide the best performance.  Which advisor would you use to determine the suitable size of the SGA？（）

• A、 SQL Tuning Advisor
• B、 Undo Advisor
• C、 ADDM
• D、 Memory Advisor

第2题：

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

第3题：

You are maintaining your database in Oracle10g. You perform a full user-managed backup every Sunday at 8：00 P.M. Your database is running in ARCHIVELOG mode. On Monday， at 9：00 A.M.， a tablespace is dropped. You decide to perform incomplete recovery to recover the dropped tablespace.  Which two clauses can you use with the RECOVER command？（）

• A、 UNTIL SEQUENCE
• B、 UNTIL SCN
• C、 UNTIL CHANGE
• D、 UNTIL CANCEL

第4题：

Your database instance is configured with automatic undo management and the UNDO_RETENTION parameter is set to 900 seconds. You executed the following command to enable retention guarantee： SQL> ALTER TABLESPACE undotbs1 RETENTION GUARANTEE； What effect would this command have on the database（）

• A、The extents in the undo tablespace retain data until the next full database backup.
• B、The extents containing committed undo in the undo tablespace are not overwritten for at least 15minutes.
• C、The extents containing committed data in the undo tablespace are not overwritten until the instance isshut down.
• D、The extents containing committed undo in the undo tablespace are transferred to Flash Recovery Areabefore being overwritten.

第5题：

You have a long-running process you want to assign to a specific UNDO segment brought online for that express purpose. You are not using automatic UNDO management. What statement can be used for this task? （）

• A、ALTER DATABASE 
• B、SET TRANSACTION 
• C、ALTER ROLLBACK SEGMENT 
• D、ALTER TABLE

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第13题：

You work as a database administrator for Certkiller .com. You want to create your database with the automatic undo management feature enable.Which two tasks must you perform to achieve this？（）

• A、Set the UNDO_RETENTION parameter to AUTO.
• B、Create an initial undo segment in undotablespace.
• C、Set the UNDO_RETENTION parameter to 900 or more
• D、Set the initialization parameter UNDO_MANAGEMENT to AUTO
• E、Set the UNDO_MANAGEMENT parameter to the name of an undotablespace

第14题：

You noticed that the index tablespace in your database requires a recovery. However， instead of performing a media recovery， you decided to re-create the indexes in a new tablespace. Which two options would you use to reduce the time it takes to re-create the indexes？（）

• A、 ONLINE
• B、 REVERSE
• C、 PARALLEL
• D、 COMPRESS
• E、 NOLOGGING
• F、 COMPUTE STATISTICS

第15题：

You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace， UNDO_TBS1， in your database. Which two additional steps would you perform to achieve this？（）

• A、Set the UNDO_RETENTION parameter to 900 or more.
• B、Create an initial undo segment in the undo tablespace.
• C、Enable the retention guarantee for the undo tablespace.
• D、Set the UNDO_TABLESPACE parameter to UNDO_TBS1.
• E、Set the UNDO_MANAGEMENT initialization parameter to AUTO.

第16题：

The system was running a normal workload during the last 24 hours. You need to ensure that with the same workload you should be able to flashback tables by three hours. What would you do to find the system recommendations for the undo retention period and the undo tablespace size?（）

• A、set DB_FLASHBACK_RETENTION_TARGET=10800  
• B、create a new scheduler window for the time period of 24 hours and use the optimizer statistics 
• C、modify the Automatic Workload Repository (AWR) snapshot time interval to three hours and use ADDMfindings 
• D、specify New Undo Retention as three hours and Analysis Time period as Last One Day in the Undo Advisor page and use its recommendations

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