The primary advantages of a Client/Server system arise from splitting the processing between the client system and the database 

admin2009-05-15  53

问题 The primary advantages of a Client/Server system arise from splitting the processing between the client system and the database server. Since the bulk of the database processing is done on the back-end, the speed of the DBMS isn’t tied to the speed of the(31).The major disadvantage of Client/Server system is the increased cost of(32) and support personnel who maintain the database server. There is also the issue of(33)with so many parts comprising the entire C/S system; Murphy’s Law can kick in-the more pieces that compose the system, the more pieces that can fail. It’s also harder to track down problems when the system(34). And it can initially take longer to get all the components set up and working together. All this is compounded by the general lack of experience and expertise of potential support personnel and programmers, due to the relative newness of the technology. As C/S system become more common, this problem should abate.Therefore the C/S system is more(35).

选项 A、efficient and easy to setup
B、efficient and robust
C、efficient but difficult to maintain
D、robust but difficult to setup

答案C

解析 客户机/服务器(C/S)系统的主要优点来自它把客户端和数据库服务器的处理进行分离,因为大量的数据处理放在后台完成,DBMS的速度不会受到工作站速度的影响。C/S系统的主要缺点是维护数据库服务器的管理和支持人员的成本增加。另外,因为C/S系统由很多模块组成,从而增加了系统的复杂性。Murphy定理表明,组成系统的模块越多,失败的模块就越多。当系统崩溃时,很难跟踪到错误之处。而且,C/S需要首先花很长的时间进行构件开发和组装。因为相对来说,这些技术比较新,缺乏经验、技术支持专家和程序员,但随着C/S系统的普及,这个问题将得到缓解。因此,C/S系统的效率高,但维护困难。
这是一道关于OS结构模式的讨论试题。C/S是基于资源不对等,且为实现共享而提出来的,是20世纪90年代成熟起来的技术,CIS结构将应用一分为二,服务器(后台)负责数据管理,客户机(前台)完成与用户的交互任务。C/S结构具有强大的数据操作和事务处理能力,处理速度快。但C/S结构维护十分困难,软件只要修改一小点,都要重新安装所有客户端程序。
转载请注明原文地址:https://jikaoti.com/ti/v6J7FFFM
0

随机试题
最新回复(0)