There is nothing in this world constant but inconstancy.—SWIFT
Project after project designs a set of algorithms and then plunges into construction of customer-deliverable software on a schedule that demands delivery of the first thing built.In most projects,the first system built is（ ）usable.It may be too slow,too big,awkward to use,or all three.There is no（ ）but to start again,smarting but smarter,and build a redesigned version in which these problems are solved.The discard and（请作答此空）may be done in one lump,or it may be done piece-by-piece.But all large-system experience shows that it will be done.Where a new system concept or new technology is used,one has to build a system to throw away,for even the best planning is not so omniscient（全知的）as to get it right the first time.The management question,therefore,is not whether to build a pilot system and throw it away.You will do that.The only question is whether to plan in advance to build a（ ）,or to promise to deliver the throwaway to customers.Seen this way,the answer is much clearer.Delivering that throwaway to customers buys time,but it does so only at the（ ）of agony（极大痛苦）for the user,distraction for the builders while they do the redesign,and a bad reputation for the product that the best redesign will find hard to live down.Hence plan to throw one away;you will,anyhow.
A.design
B.redesign
C.plan
D.Build
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【说明】某软件企业开发一套类似于淘宝网上商城业务的电子商务网站。该系统涉及多种用户角色，包括购物用户，商铺管理员，系统管理员等。在数据库设计中，该系统数振库的核心关系包括：产品（产品编码,产品名称，产品价格，库存数量，商铺编码）商铺（商铺编码,商铺名称，商铺地址，商铺邮箱，服务电话）；用户（用户编码，用户名称,用户地址，联系电话）订单（订单编码，订单日期，用户编码，商铺编码，产品编码,产品数量,订单总价）不同用户角色也有不同的数据需求，为此该软件企业在基本数据库关系模式的基础上，定制了许多试图。其中，有很多视图涉及到多表关联和聚集函数运算。【问题2】（8分）为解决该枧图查洵性能比较差的问题，张工建议为该数据建立单独的商品当天货物销售、存货情况的关系表。但李工认为张工的方案造成了数据不一致的问题，必须采用一定的手段来解决。1）说明张工方案是否能够对该视图查询性能有所提升，并解释原因：2）解释说明李工指出的数据不一致问题产生的原因。
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