用Linux ls-al命令列出下面的文件列表，(33)是块设备文件。

A．drwx----1 hel users 1024 Sep 10 08:10 aaa

B．-rw----2 hel-s users 56 Sep 09 11:05 bbb

C．brw----2 hel-s users 56 Sep 09 11:05 ccc

D．1rwx----1 hel users 2024 Sep 12 08:12 ddd

相关问题推荐

• 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

  查看答案

• You plan to use SQL Performance Analyzer to analyze the SQL workload. You created a SQL Tuning Set as a part of the workload capturing.  What information is captured as part of this process？（）

  A

   the SQL text

  B

   the execution plan

  C

   the execution context

  D

   the execution frequency

  E

   the system change number （SCN）

  查看答案

• 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

  查看答案

• 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.

  查看答案

• 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

  查看答案