數(shù)據(jù)庫畢業(yè)設計---外文翻譯-其他專業(yè)(已改無錯字)
2023-03-03 11:56:25 本頁面
【正文】 ost. Failures cannot be tolerated. For example, once the money has been ejected from an ATM machine ,the bank must record the debit, even if the power immediately fails. On the other hand, it is not permissible for the bank to record the debit and then not deliver the money because the power fails. The proper way to handle this operation is far from obvious and can be regarded as one of the significant achievements in DBMS architecture. Database system changed significantly. Codd proposed that database system should present the user with a view of data anized as tables called relations. Behind 學士畢業(yè)論文 4 the scenes, there might be a plex data structure that allowed rapid response to a variety of queries. But unlike the user of earlier database systems, the user of a relational system would not be concerned with storage structure. Queries could be expressed in a very high level language, which greatly increased the efficiency of database programmers. Relations are tables. Their columns are headed by attributes. Client –Server Architecture Many varieties of modern software use a clientserver architecture, in which requests by one process (the client ) are sent to another process (the server) for execution. Database systems are no exception, and it is mon to divide the work of the ponents shown into a server process and one or more client processes. In the simplest client/server architecture, the entire DBMS is a server, except for the query interfaces that the user and send queries or other mands across to the server. For example, relational systems generally use the SQL language for representing requests from the client to the server. The database server then sends the answer, in the form of a table or relation, back to client. The relationship between client and server can get more plex, especially when answers are extremely large. We shall have more to say about this matter in section . there is also a trend to put more work in the client, since the server will be a bottleneck if there are many simultaneous database users. 學士畢業(yè)論文 5 附錄 B: 外文資料翻譯－譯 文 部分： 客戶目標： 最早判斷發(fā)展可收益卡的成功性是在于受市場影響的被吸引的申請人的質量。不僅需要有足夠信用度的申請人以避免高花費卻無益的過程，但同時所有賬戶的綜合是否能符合保證最終獲利的需要也是決定性的。比如，市場初期可能會吸引到足夠量的客戶，但是在上半段接受的比例就遠不足以分配給收益水平和越少的再無所需的達到金融目標的計劃。 本章考慮了數(shù)據(jù)源的范圍能夠支持信用卡計劃的發(fā)展和可以應用在市從各種需求種類中最大化申
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