053(十二）

最新推荐文章于 2025-09-11 20:53:34 发布

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最新推荐文章于 2025-09-11 20:53:34 发布

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文章标签：数据库

原文链接：http://www.cnblogs.com/huanhuanang/p/5387376.html

本文探讨了在Oracle数据库中使用回收站恢复已删除表及其块更改跟踪功能的实现过程。通过执行特定SQL语句，可以将回收站中的表恢复到删除前的状态，并重命名其中一个表为my_table2。同时，介绍了自动工作负载仓库（AWR）基线的创建方式及背景进程ASMB的相关信息。文章还讨论了配置Oracle Managed Files（OMF）和启用块更改跟踪的方法，以及如何利用资源管理器功能设置任务优先级和ID超时时限。

56、

56.You discover that your Recycle Bin contains two tables with the same name, MY_TABLE. You also have a table named MY_TABLE in your schema. 
You execute the following statement:
FLASHBACK TABLE my_table TO BEFORE DROP RENAME TO my_table2;
What will be the result of executing this statement?
A. One of the tables is recovered from the Recycle Bin using a First In First Out (FIFO) approach.
B. One of the tables is recovered from the Recycle Bin using a Last In First Out (LIFO) approach.
C. Both the tables are recovered from the Recycle Bin with one table renamed to MY_TABLE2 and the other to a system-generated name.
D. None of the tables are recovered from the Recycle Bin, and the statement returns an error.

Answer: B

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57、

57.Which background process of a database instance, using Automatic Storage Management (ASM), connects as a foreground process into the ASM instance?
A. ASMB
B. PMON
C. RBAL
D. SMON

Answer: A

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58、

58.Which statement is true when Automatic Workload Repository (AWR) baselines are created using baseline templates?
A. AWR baselines are always created as repeating baselines.
B. AWR baselines can be created on the basis of two time values.
C. AWR baselines are always created with infinite expiration duration.
D. AWR baselines are always created using the Automatic Workload Repository (AWR) retention period as expiration duration.

Answer: B

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59、

59.You have not configured Oracle Managed Files (OMF) in your database. 
You do not want to scan the entire datafile every time an incremental backup is performed. 
You decide to enable the block change tracking feature. 
Which statement should you use to enable the block change tracking feature?
A. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING;
B. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING USING FILE <path>;
C. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE <path>;
D. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING;

Answer: C

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60、

60.For which two situations would you use functionality provided by the Resource Manager? (Choose two.)
A. setting idle timeout limits on resource plans
B. saving storage space by using compressed backup sets
C. creating jobs that will run automatically at a scheduled time
D. assigning priorities to jobs to manage access to system resources
E. creating alerts to perform notification when tablespaces are low on available space resources