单选题View the Exhibit and examine the recommendation graph provided for a test database by the Undo Advisor.The graph recommends that the size of undo tablespace should be set to（）.A 1 MB B 6 MB C 10 MB D 15 MB E 11 MB

第1题：

第2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 before using the Undo Advisor to estimate the capacity of the undotablespace（）

• A、The retention period to support flashback
• B、The expected length of the longest-running query
• C、The number of undo tablespaces in the database
• D、The size of the Flash Recovery Area for the database instance

第3题：

第4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5题：

Automatic Shared Memory Management （ASMM） has been enabled for your database instance.  Theinitialization parameters for the components that are managed by ASMM are not set. After observing theeffects of ASSM， you executed the following command： SQL> ALTER SYSTEM SET DB_CACHE_SIZE = 100M；  Which statement is true in this scenario（）

• A、The minimum memory size for the database buffer cache is set to 100 mb.
• B、The maximum memory size that can be obtained by the database buffer cache during ASMM is set to100 mb
• C、The minimum memory size allocated for a server process in the database buffer cache in dedicatedmode is set to 100 mb.
• D、The maximum memory size from the database buffer cache that can be released for dynamicdistribution during ASMM is set to 100 mb

第6题：

In which situation is the UNDO_RETENTION parameter be ignored， even if it is set to a value（）

• A、When the data file of the undo tablespace is autoextensible
• B、When there are more than one undo tablespaces available in the database
• C、When the undo tablespace is of a fixed size and retention guarantee is not enabled
• D、When the undo tablespace is autoextensible and retention guarantee is not enabled

第7题：

Users in your PROD database complain about the slow response of the transactions. While investigating the reason， you find that the transactions are waiting for the undo segments to be available， and undo retention has been set to zero. What would you do to overcome this problem？（）

• A、increase the undo retention
• B、create more undo segments
• C、create another undo tablespace
• D、increase the size of the undo tablespace

第8题：

第9题：

In which situation may the UNDO_RETENTION parameter be ignored， even if it is set to a value（）

• A、when the data file of the undo tablespace is autoextensible
• B、when there are more than one undo tablespaces available in the database
• C、when the undo tablespace is of a fixed size and retention guarantee is not enabled
• D、when the undo tablespace is autoextensible and retention guarantee is not enabled

第10题：

Examine the exhibit to view the parameters set in your parameter file. (Click the Exhibit(s) button.) You restart the instance. To what value will the MEMORY_MAX_TARGET parameter be set by default?（）

• A、120M
• B、320M
• C、480M
• D、600M