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：

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2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3题：

You want to use the Flashback Transaction Query feature to identify all the changes made to your database within a specific time period. What is a prerequisite for using the Flashback Transaction Query feature？（）

• A、 You must use automatic undo management in the database.
• B、 You must configure OMF in your database.
• C、 You must configure ASM for storing the datafiles.
• D、 You must multiplex the online redo log file.

第4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5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6题：

You are maintaining your OLTP database in Oracle10g. You are performing the Flashback Transaction Query to find the undo SQL statements that can be used to undo the changes made to the database in the specific time period. Which pseudocolumn will you use to perform the Flashback Transaction Query？（）

• A、 VERSIONS_STARTSCN
• B、 VERSIONS_STARTTIME
• C、 VERSIONS_XID
• D、 VERSIONS_OPERATION

第7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8题：

Your database instance is running with full workload after database creation. You have decided to useafixed-sizeundo tablespace. You want to use the Undo Advisor to estimate the capacity of the undotablespace.  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9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10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.