英语翻译Consider the case of a mail-order firm shown in Figure 5

英语翻译
Consider the case of a mail-order firm shown in Figure 5.16.On the left side,customer Sanchez sent a payment on his account.At the same time the clerk begins to process the payment,Sanchez calls a second clerk and places a new order.The figure shows what happens if both transacions continue and interfere with each other.What should the final balance be?Does the computer have the correct number?To solve this problem,the application program must know that several people might try to access the same piece of data at the same time.The software locks out all users except one.When the first process is finished,the other users can try to gain access again.To keep data accurate,applications used by many people at the same time must be written to handle these concurrency problems.Early personal computers were designed for only one user,so much of the software did not prevent concurrency problems.Software designed for computer networks generally handles this issue.When you use this software,you will occasionally receive a message that says a piece of data you desire is currently being used by another person.If you get this message,simply wait for a few minutes and try again.When the first person is finished,you should be able to proceed.

考虑邮购公司的情况下,如图5.16.在左边,客户桑切斯就差遣人去见他的帐户付款与此同时,职员开始处理付款,桑切斯所谓的店员二和地方的新秩序这个图展示了发生什么事,如果两transacions继续和彼此干扰最后应该如何平衡?计算机到底有正确的号码吗要解决这个问题,应用程序必须知道,一些人可能会试图存取同一个件资料在同一时间内.软件把所有用户,只有一个除外当第一个过程完成,其他用户可以尝试获得了.保持数据准确、应用程序所使用的许多人在同一时间必须被写处理这些并发问题.早年的个人计算机是被设计只在一个用户,这么多的软件不能防止并发量的问题.软件设计的一种计算机网络一般处理这个问题.当你使用这个软件,你也会偶尔收到短信说你想要的一段数据正在使用的另外一个人如果你得到这个消息,只是等待几分钟,然后再试一次当第一个人完成的时候,你应该能够继续下去