单项选择题
You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table， you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that：
a） No other user data in the database is affected.
b） The operation takes the minimum possible time.
Which option would you choose？（）
A. Use ROLLBACK command with SCN 663571.
B. Perform Flashback Transaction Query with SCN 663571.
C. Execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571.
D. Execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571.
相关考题
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多项选择题
YourdatabaseisfunctioninginNOARCHIVELOGmode.Yourdatabasecontains15tablespaces.YouwanttouseRecoveryManager（RMAN）toperformbackups.Whichtwobackupswouldyoubeabletoperformwhenthedatabaseisbeingaccessedbyusers？（）
A. Backup of offline tablespaces.
B. Backup of read-only tablespaces.
C. Backup of system-critical tablespaces.
D. Backup of online， locally managed tablespaces.
E. Backup of read/write dictionary-managed tablespaces. -
单项选择题
Inoneofyouronlinetransactionprocessing（OLTP）applications，mostusersfrequentlymodifythevalues，includingthekeyvalues，oftheapplicationtables.Someusersgenerateapplicationreportsbyusingmultipleapplicationtables.Whatisthebesttablestructurethatyoucanusetogainoptimalperformance？（）
A. Heap table
B. Object table
C. External table
D. Clustered table
E. Global temporary table
F. Index-organized table （IOT） -
单项选择题
Youhavebeenassignedtomanageasetofdatabases.ThepreviousDBAdidnotleaveyounotesregardingthestructureofeachofthedatabases.Whileanalyzinganinstance，younoticethatthesystemidentifier（SID）fortheinstanceissetto’+ASM’.Whatisthepurposeofthisinstance？（）
A. This instance is being used to manage the operating system files.
B. This instance is being used to manage the files of other databases.
C. This instance is being used to manage the instances of other databases.
D. This instance is being used to manage the background processes of other instances.
