在Windows Server 2003下若选择安全登录，则首先需要按(38)组合键。

A．Shiff+Alt+Esc

B．Ctrl+Alt+Tab

C．Ctrl+Shiff

D．Ctrl+Alt+Delete

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• What happens when you run the SQL Tuning Advisor with limited scope？（）  

  A、 Access path analysis is not performed for SQL statements.

  B、 SQL structure analysis is not performed for SQL statements.

  C、 SQL Profile recommendations are not generated for SQL statements.

  D、 Staleness and absence of statistics are not checked for the objects in the SQL Tuning Advisor.

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• You perform a backup using the following BACKUP command: RMAN> BACKUP AS COMPRESSED BACKUPSET DATABASE; Which statement is true of this command?（）

  A、A different procedure is required to restore a database from compressed backups

  B、The AS COMPRESSED clause of the BACKUP command provided by RMAN is used to create compressed backup sets and image copies.

  C、Using this command to create backups minimizes the bandwidth consumed

  D、Using this command to create backups improves the performance of the backup process

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• Note the following parameters settings in your database: SGA_MAX_SIZE = 1024M SGA_TARGET = 700M DB_8K_CACHE_SIZE = 124M LOG_BUFFER = 200M You issued the following command to increase the value of DB_8K_CACHE_SIZE: SQL> ALTER SYSTEM SET DB_8K_CACHE_SIZE=140M; What would happen?（）

  A、It will fail because DB_8K_CACHE_SIZE parameter cannot be changed dynamically

  B、It will be successful only if the memory is available from the auto tuned components

  C、It will fail because an increase in DB_8K_CACHE_SIZE cannot be accommodated within SGA_TARGET

  D、It will fail because an increase in the DB_8K_CACHE_SIZE cannot be accommodated within SGA_MAX_SIZE

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• What is the purpose of the catalog command？（）  

  A、 To review RMAN control file and recovery catalog metadata and ensure that its correct

  B、 To delete RMAN backup-related metadata from the recovery catalog

  C、 To create metadata in the control file and the recovery catalog related to backup set pieces 

  D、 To create a report that lists database backups

  E、 To rebuild the recovery catalog

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• “TCPSYNFlooding”建立大量处于半连接状态的TCP连接，其攻击目标是网络的(43)。

  A．保密性

  B．完整性

  C．真实性。

  D．可用性

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