单选题You work as a database administrator at Certkiller .com. 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 EMPLOYEEStable. Two days ago， the 

第1题：

You work as a database administrator for Certkiller .com. In your transaction application， you have scheduled a job to update the optimizer statistics at05：00 pm every Friday. The job has successfully completed. Which three pieces of information would you check to confirm that the statistics have been collected？（）

• A、Average row size
• B、Last analyzed date
• C、Size of table in bytes
• D、Size of table in database blocks
• E、Number of free blocks in the free list
• F、Number of extents present in the table.

第2题：

You work as a database administrator for Certkiller .com. In the Certkiller PRODUCTION database you have granted RESUMABLE system privilege to the CONNECT role.Resumablespace operation has been enabled for all user session. You want users NOT to be aware of any kind of space-related problems while performing transactions. Instead， you want the problem to be resolved by a database trigger automatically. Which combination of triggering time and event would you use to achieve this objective？（）

• A、AFTER CREATE
• B、AFTER SUSPEND
• C、BEFORE CREATE
• D、AFTER TRUNCATE
• E、BEFORE SUSPEND
• F、AFTER INSERT OR DELETE OR DELETE
• G、BEFORE INSERT OR DELETE OR DELETE

第3题：

You work as a database administrator for Certkiller .com. You are using three database， Certkiller DB01， Certkiller DB02， and Certkiller DB03， on different host machines in your development environment. The database serverconfiguration， such as IP address and listener port number， change frequently due to development requirements， and you havethe task of notifying the developers of the changes. Which connection method would you use to overcome this overhead？（）

• A、Host naming
• B、Local naming
• C、Easy Connect
• D、External naming
• E、directory naming

第4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 the 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

第5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6题：

You are working in an online transaction processing (OLTP) environment. You use the FLASHBACKTABLE 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. Now, you need to reverse the effects of the FLASHBACK TABLE command. Which is the fastest and the most efficient option to reverse the effects of the FLASHBACK TABLE command?（）

• A、Restore the backup control file and open the database with RESETLOGS option.
• B、Perform point-in-time recovery because flashback cannot be performed again on this table
• 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

第7题：

You work as a database administrator for Certkiller .com. Your database is in the MOUNT state and you execute the following command to open it ALTER DATABASE OPEN； What two actions are performed as a result of this command？（）

• A、All control files are opened
• B、All redo files are opened
• C、The password file is opened
• D、The parameter file is opened
• E、All online data files are opened

第8题：

You work as a database administrator for Certkiller .com. Your database is in NOARCHIVELOG mode and you want to perform a backup. Which type of backup would be appropriate in this case？ （）

• A、Hot backup
• B、Online backup
• C、consistent backup
• D、incremental backup
• E、inconsistent backup

第9题：

You work as a database administrator for Certkiller .com. Users in the Certkiller .com PROD database complain about the slow response of 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 return
• B、Create more undo segments
• C、Create another undotablespace
• D、Increase the size of the undotablespace

第10题：

You work as a database administrator for Certkiller .com. In the middle of a transaction， a user session was abnormally terminated but the instance is still up and the database is open. Which two statements are true in this scenario？（）

• A、Event Viewer gives more details on the failure.
• B、The alert log file gives detailed information about the failure.
• C、PMON rolls back the transaction and releases the locks.
• D、SMON rolls back the transaction and releases the locks.
• E、The transaction is rolled back by the next session that refers to any of the blocks updates by the failed transaction.
• F、Data modified by the transaction up to the last commit before the abnormal termination is retained in the database.