You are designing an application for a telecom company and you have been asked to design a database table to facilitate monthly bill generation. The bill would include details of customer calls， listed in chronological order.  Which method would you follow to achieve this objective without increasing the overhead of sorting the rows？（）

A、create a hash cluster to store the data

B、create an index cluster to store the data

C、create a partitioned table to store the data

D、create a sorted hash cluster to store the data

E、create a heap table with rowid to store the data

要打开一个视图以便浏览或更新其中的数据，可以使用命令（　　）。

A、USE

B、USEVIEW

C、BROWSE

D、BROWSEVIEW

Using the LIST command in Recovery Manager (RMAN), which two pieces of information in the RMANrepository can be listed?（）

stored scripts in the recovery catalog

backups that can be deleted from disk

backup sets and image copies are obsolete

backups that do not have the AVAILABLE status in the RMAN repository RMAN

在堆栈类SharedStack的定义中，为了保证堆栈在并发操作中数据的正确性，应在下划线处填入的修饰符是（　　）。（两个下划线的填写内容相同）public class SharedStack { ______ int idx = 0; ______ char[] data = new char[10]; public synchronized void push(char c){……} public synchronized void pop(){……}}

A、public

B、不使用修饰符

C、private

D、protected

Matthew has recently joined NetFx Corporation as a junior-level Database Administrator （DBA）. He is asked by his supervisor to verify the database for data block corruptions. He uses the DBVERIFY utility and finds that two data blocks are corrupted in the database.   What should Matthew use to identify the corrupted blocks as well as datafiles containing these blocks？（） 

A、 datafile

B、 alert log

C、 dynamic views

D、 control file script

执行查询文件myquery.qpr的命令是（　　）。

A、DO myquery

B、DO myquery.qpr

C、DO QUERY myquery

D、RUN QUERY myquery