You are required to flashback your database. You want to find the amount of flashback data generated since the database was opened. Which task will you perform to obtain the required information？（）A、 Query the V$FLASHBACK_DATABASE_LOG view.B、 Query the V$

第1题：

You are working as a DBA at NetFx Corporation. You discover that the SCOTT schema is deleted by mistake. You decide to flash the database back to the time when the schema existed. Which view will you query to determine the estimated size of the flashback data that you require for your current target retention？（）

• A、 V$FLASHBACK_DATABASE_LOG
• B、 V$FLASHBACK_DATABASE_STAT
• C、 V$DATABASE
• D、 V$UNDOSTAT

第2题：

You are maintaining the SALES database for an organization. You have enabled the Flashback Database feature and want to estimate the flashback space required for future operations.  Which view would you query to estimate the flashback space required？（）

• A、 V$DATABASE
• B、 V$FLASHBACK_DATABASE_STAT
• C、 V$FLASHBACK_DATABASE_LOG
• D、 V$RECOVERY_FILE_DEST

第3题：

第4题：

These are the details about V$FLASHBACK_DATABASE_STAT：  SQL> DESC V$FLASHBACK_DATABASE_STAT Name Null？ Type  ------------- -------- --------------  BEGIN_TIME DATE END_TIME DATE  FLASHBACK_DATA NUMBER  DB_DATA NUMBER REDO_DATA NUMBER  ESTIMATED_FLASHBACK_SIZE NUMBER  Which two statements regarding the V$FLASHBACK_DATABASE_STAT view are true？ （）

• A、BEGIN_TIME is the time at which Flashback logging is enabled.
• B、END_TIME is the time at which the query is executed on the view.
• C、REDO_DATA is the number of bytes of redo data written during the interval.
• D、This view contains information about flashback data pertaining to the last 24 hours.
• E、FLASHBACK_DATA is the amount of flashback data generated since the database was opened.

第5题：

You can use Oracle Flashback to look at past activity in your database. What are two other characteristics of Oracle Flashback？（）

• A、Oracle Flashback uses undo information to construct consistent data. 
• B、You can use a cursor opened while using an Oracle Flashback image to perform DML once you deactivate Oracle Flashback in your session. 
• C、You can only use Oracle Flashback view of the data if the required records are still in the online redo log files. 
• D、Oracle Flashback lists the DML that was executed during the period you identify when initiating your session. 

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：

On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30 am. Which option must you use to check whether a flashback operation can recover the database to the specified time? （）

• A、Check the alert log file
• B、Query the V$FLASHBACK_DATABASE_LOG view
• C、Query the V$RECOVERY_FILE_DEST_SIZE view
• D、Query the V$FLASHBACK_DATABASE_STAT view
• E、Check the value assigned for the UNDO_RETENTION parameter

第8题：

You are maintaining a database that is in ARCHIVELOG mode. You have configured the flash recovery area in your database. The database is in MOUNT EXCLUSIVE mode， and you want to configure the Flashback Database feature. Which two options are NOT required to configure the Flashback Database feature？ （）

• A、 Open the database in read-only mode.
• B、 Set the retention target with the DB_FLASHBACK_RETENTION_TARGET initialization parameter.
• C、 Enable the block change tracking feature.
• D、 Execute the ALTER DATABASE FLASHBACK ON statement.

第9题：

You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEES table. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area.  Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）

• A、perform point-in-time recovery
• B、perform a Flashback Table operation to restore the table to the state it was in two days ago
• C、perform a Flashback Database operation to restore the database to the state it was in two days ago
• D、perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery

第10题：

You query the ORDERS table and discover that order number 1101 is missing. One of your reports， generated at 5：00 A.M. on April 23， 2005 using Oracle Reports， includes this order number in the output. You have inserted 100 new orders into the ORDERS table since generating this report. Which flashback technology would you use to recover order number 1101 into the ORDERS table without losing the 100 orders that you added after the report was generated？（）  

• A、 Flashback Table
• B、 Flashback Query
• C、Flashback Version Query
• D、 Flashback Transaction Query