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
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
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
在执行语句SELECT department_id FROM employees,departments WHERE employees.department_id= departments.department_id;时报错,原因是()。
A、没有给表employees和表departments加别名
B、没有给列department_id加别名
C、不能用employees.department_id=departments.department_id作为条件
D、SELECT后面的department_id没有指定是哪个表
()是正确的E-mail地址。
A、mailto:Webmaster@ceiaeC.org
B、Wmailto:master@ceiaec.org
C、http://www.ceiaeC.org
D、D.http://www.ceiaeorg