下列口令维护措施中,不合理的是()。
A、第一次进入系统就修改系统指定的口令
B、怕把口令忘记,将其记录在本子上
C、去掉guest(客人)账号
D、限制登录次数
根据我国目前本地移动电话编号方案,移动网业务区号为()。
A、3位
B、4位
C、7位
D、8位
An administrator plans to apply a fix pack to the PowerHA software using a rolling migration. At what stage ofthe migration is a cluster verification supported?()
A、Individually before each node is upgraded
B、Individually before and after each node is upgraded
C、Individually after each node has been upgraded
D、Collectively after all nodes have been upgraded
An administrator has integrated a new application into an existing resource group. An application server withstart and stop scripts was defined and added to the resource group definition. The cluster was thensynchronized. How can the new application be started with minimal downtime?()
A、The administrator will need to perform an rg_move operation
B、The administrator will need to un-manage and re-manage the resource group
C、The administrator will need to execute the new start script from the command line
D、The new start script will be executed as part of the DARE operation to synchronize the cluster
计算机系统由哪两部分组成的?计算机硬件结构由哪几部分组成?它们各自有什么作用?
某数据库中有员工关系E(员工号,姓名,部门,职称,月薪);产品关系P(产品号,产品名称,型号,尺寸,颜色);仓库关系W(仓库号,仓库名称,地址,负责人);库存关系I(仓库号,产品号,产品数量)。a.若数据库设计中要求:①仓库关系W中的"负责人"引用员工关系的员工号。②库存关系I中的"仓库号,产品号"唯一标识I中的每一个记录。③员工关系E中的职称为"工程师"的月薪不能低于3500元。则①②③依次要满足的完整性约束是(1)。b.若需得到每种产品的名称和该产品的总库存量,则对应的查询语句为:SELELCT产品名称,SUM(产品数量)FROMP,IWHEREP.产品号=I.产品号(2)空白(1)处应选择()
A、实体完整性、参照完整性、用户定义完整性
B、参照完整性、实体完整性、用户定义完整性
C、用户定义完整性、实体完整性、参照完整性
D、实体完整性、用户定义完整性、参照完整性