Your boss at Certkil...

单项选择题X 纠错

Your boss at Certkiller .com wants you to clarify Oracle 10g. Which condition in your database forces you to perform only consistent backups？（）

A.The database is in mount state.
B.One of the tablespaces is offline.
C.One of the tablespaces is read only.
D.The database operates in ARCHIEVELOG mode.
E.The database operates in NOARCHIEVELOG mode.

参考答案：

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多项选择题

You work as a database administrator for Certkiller .com. Users in the Certkiller PROD database complain about the slow response when accessing the database. In the Active Session Waiting： Configuration page you find that the majority of the wait time is for the redo log buffer.Further investigation using the Run Queue graph and operating system tools reveals that the redo log files are on the same disks， and that the disk I/O for the redo log files is the reason for the performance degradation.
Which two actions would you take to gain performance？（）

A.Increase the size of redo log files
B.Increase the size of redo log buffer
C.Increase the number of redo log files
D.Place the redo log files on a separate disk
E.Decrease the number of redo log groups to two
F.Increate the number Log Writer （LGWR） process

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单项选择题

You work as a database administrator for Certkiller .com. Redo log files are not multiplexed in your database. Redo log blocks are corrupted in group 2， and archiving has stopped. All the redo logs are filled and database activity is halted. Database writer has written everything to disk.
Which command would you execute to proceed further？（）

A.RECOVER LOFIEL BLOCK GROUP 2；
B.ALTER DATABASE DROP LOGFILE GROUP 2；
C.ALTER DATABASE CLEAR LOGFILE GROUP 2；
D.ALTER DATABASE RECOVER LOGFILE GROUP 2；
E.ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 2；

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单项选择题

You work as a database administrator for Certkiller .com. In your database server， the parameter PLSQL_OPTIMIZE_LEVEL has been set to 2. What would this setting achieve？（）

A.It degrades the run time and compiler performance.
B.It provides better run time and compiler performance.
C.It provides better optimization of the statement during parse time.
D.It forces the rule based optimizer to be used for statement optimization.
E.It provides better run time performance but slightly degraded compiler performance.
F.It provides better run time performance but slightly degraded run time performance.

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单项选择题

You work as a database administrator for Certkiller .com. You find that reports are running for a long time in your data warehousing applications. You suspect a lack of indexes is the reason for the performance degradation.
Which advisory component would you refer to， in order to determine the appropriate indexes？（）

A.Memory Advisors
B.Segment Advisors
C.SQL Tuning and Access Advisors
D.Automated Workload Repository （AWR）
E.Automatic Database Diagnostic Monitor （ADDM）

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单项选择题

Two database users， Jack and Bill， are accessing the Certkiller STAFF table of the Certkiller DB database. When Jack modifies a value in the table， the new value is invisible to Bill.
Which is the modified value invisible to Bill？（）

A.The modified data are not available on disk.
B.The modified data have been flushed out from memory.
C.The modified rows of the Certkiller STAFF table have been locked.
D.Jack has not committed the changes after modifying the value.
E.Both users are accessing the database from two different machines.

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单项选择题

You work as a database administrator for Certkiller .com. As a result of performance analysis， you created an index on theprod_namecolumn of the
Certkiller prodtable， which contains about ten thousand rows. Later， you updated a product name in the table.
How does this change affect the index？（）

A.A leaf will be marked as invalid.
B.An update in a leaf row takes place.
C.The index will be updated automatically at commit.
D.A leaf row in the index will be deleted and inserted.
E.The index becomes invalid when you make any updates

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多项选择题

You work as a database administrator for Certkiller .com. You have set the retention period for Automatic Repository （AWR） statistics to four days and collection interval to 15 minutes. You want to view the statistics collected and stored in AWR snapshot. Which two methods would you use to view the AWR statistics？（）

A.use enterprise manager
B.use DBMS_SQL package
C.use DBMS_AWR package
D.use PRVT_WORKLOAD package
E.query the AWR snapshot repository objects
F.use DBMS_WORKLOAD_REPOSITORY package

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单项选择题

You are working on the Certkiller database.
What is the default name of the alert log file in this database？（）

A.alert_ Certkiller .log
B.alertlog_ Certkiller .log
C.alert_log_ Certkiller .log
D.Certkiller _alert_log.log
E.log_alert_： Certkiller .log
F.trace_alert_ Certkiller .log

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单项选择题

You work as a database administrator for Certkiller .com. In a production environment， users complain about the slow response time when accessing the database. You have not optimized the memory usage of the Oracle instance and you suspect the problem to be with the memory. To which type of object would you refer to determine the cause of the slow response？（）

A.The trace file
B.The fixed views
C.The data dictionary views
D.The operating system log fields
E.The dynamic performance views.

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单项选择题

You work as a database administrator for Certkiller .com. The database is open. A media failure has occurred， resulting in loss of all the control files in your database. Which statement regarding the database instance is true in this scenario？（）

A.The instance would hang.
B.The instance needs to be shut down.
C.The instance would be in the open state.
D.The instance would abort in such cases.
E.The instance would be in the open and invalid state.
F.The instance would in the open state， but all the background processes will be restarted.

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