那些参数标识了sa?那些参数表现了一个特定sa的本质?
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
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
在教师表中,如果要找出职称为“教授”的教师,所采用的关系运算是( )。
A、投影
B、选择
C、联接
D、自然选择
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
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