In which scenario do...

单项选择题In which scenario do you use the Flashback Database feature？（）

A. when a table is dropped and you restore it from the Recycle Bin
B. when a user’s schema is dropped and you recover the user’s schema
C. when some incorrect data is inserted in the table and you retrieve the table to a state that was at a certain timestamp
D. when a row of a table is updated frequently and committed， and you view all the versions of the row within a specific duration

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1.单项选择题 An important tablespace of your database is dropped by mistake. You use the Flashback Database feature to retrieve the tablespace. You perform the following steps to retrieve the tablespace：
1. You log on to Enterprise Manager as SYSDBA.
2. You select the maintenance screen.
3. You choose Perform Recovery option on the maintenance screen.
4. You choose Whole Database in the Object Type drop-down list Perform Recovery： Type screen. 5. You choose Recover to Current Time from the Operation Type on the Perform Recovery： Type screen.
6. You provide the Host Credentials for a database user. on the Perform Recovery： Type screen.
7. You click the continue button.
An information screen appears saying that the database is unavailable. What is this information screen？（）

A.Recovery Manager
B.Recovery Window
C.Recovery Wizard
D.Enterprise Manager Home Page

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2.单项选择题Flashback Database is enabled in your Oracle 10g database. One of your database users erroneously purged an important table residing in his schema. The table was purged sometime between 10：00 P.M. and 10：30 P.M. The next day， you decide to flash back the database. Before you flash back the database， you want to ensure that you have all the necessary flashback data. Which dynamic performance view must you use to determine whether you have the required flashback data to recover the purged table？（）

A. V$DATABASE
B. V$UNDOSTAT
C. V$FLASHBACK_DATABASE_LOG
D. V$FLASHBACK_DATABASE_STAT

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3.单项选择题 You are working as a DBA on Oracle Database 9i. You plan to upgrade your 9i database to Oracle 10g. To be familiar with the new database technology， you decide to install Oracle Database 10g on your workstation at home. You create a general purpose database.
After the installation， you make the following changes in your initialization parameter file：LOG_ARCHIVE_DEST_1=’LOCATION=USE_DB_RECOVERY_FILE_DEST’
DB_RECOVERY_FILE_DEST =
’LOCATION=d：\product\10.1.0\flash_recovery_area’
DB_RECOVERY_FILE_DEST_SIZE=10g
Where are the archived redo logs stored for your database？（）

A. The archived redo logs are stored in an operating system-dependent location.
B. The archived redo logs are stored in the location specified by LOG_ARCHIVE_DEST_1.
C. The archived redo logs are stored in the location specified by DB_RECOVERY_FILE_DEST.
D. The archived redo logs are stored in the locations specified by both LOG_ARCHIVE_DEST_1 and DB_RECOVERY_FILE_DEST.

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4.单项选择题You have configured the flash recovery area to store online redo log files， control files， archived redo logs and RMAN backups. Which of the following files can you successfully delete from the flash recovery area if you want to reclaim the space within it？（）

A. multiplexed control files
B. RMAN obsolete backups
C. multiplexed online redo log files
D. archived redo logs that have not been copied to tape

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5.单项选择题 Your Oracle Database 10g is online when you execute the following statement：
SQL>ALTER TABLESPACE MY_TABLESPACE FLASHBACK OFF；
What is the result of executing this statement if the Flashback Database feature is already enabled in the database？（）

A. The database does not record flashback logs for MY_TABLESPACE
B. The tables residing in MY_TABLESPACE are not protected by the Recycle Bin.
C. All the tablespaces except MY_TABLESPACE can be recovered using Flashback Database feature.
D. None of the flashback technologies， such as Flashback Table， Flashback Transaction Query and Flashback Version Query can be used to recover individual rows within the objects from MY_TABLESPACE

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6.单项选择题At 10：30 A.M.， you ran a batch job by mistake， which executed a transaction in the database. The transaction identifier of the transaction that made to the changes in the database is 0500A00627B000. At 11：10 A.M.， you stopped the batch job. Now， you want to identify the changes made to the database tables by the batch job. Which view will you query？（）

A. DBA_PENDING_TRANSACTIONS
B. DBA_AUDIT_STATEMENT
C. V$FLASHBACK_DATABASE_STATS
D. FLASHBACK_TRANSACTION_QUERY

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7.多项选择题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.

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8.单项选择题 You dropped a schema of a user in an Oracle 10g by mistake. You decide to flash the database back to its previous state to restore the deleted schema.
Which process writes the before images of the physical database blocks to the flashback database logs？（）

A. LGWR
B. DBWR
C. MMON
D. RVWR

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9.单项选择题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$FLASHBACK_DATABASE_LOG view.
B. Query the V$FLASHBACK_DATABASE_STAT view.
C. Check the value of the DB_FLASHBACK_RETENTION_TARGET initialization parameter.
D. Query the V$RECOVERY_FILE_DEST view.

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10.多项选择题 In which two scenarios should you issue the following command？（）
FLASHBACK TABLE SCOTT.EMP TO TIMESTAMP SYSTIMESTAP- INTERVAL ’15’ MINUTE；

A. when the schema of the user， SCOTT， was deleted by mistake 15 minutes ago
B. when the table EMP of the SCOTT schema was dropped by mistake 15 minutes ago
C. when some rows of the table， EMP， in the SCOTT schema were deleted by mistake 15 minutes ago
D. when some incorrect values were inserted in the EMP table in the user Scott’s schema during the last 15 minutes
E. never， because FLASHBACK TABLE is not a valid command in Oracle 10g.

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