那些参数标识了sa？那些参数表现了一个特定sa的本质？

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

You have created a resource plan， DB_PLAN， using DBMS_RESOURCE_MANAGER.CREATE_SIMPLE_PLAN and you want to impose a restriction on utilization of resources by the database users. Which step must be performed before you can start using the resource plan？（）

A、 assign users to consumer groups

B、 set the resource plan for the instance

C、 configure a simple resource plan and specify plan directives

D、 configure a complex resource plan and specify plan directives

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

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