計(jì)算機(jī)專業(yè)畢業(yè)外文翻譯--數(shù)據(jù)庫開發(fā)過程-資料下載頁
2025-05-11 17:41本頁面
【導(dǎo)讀】基于信息工程的信息系統(tǒng)規(guī)劃是數(shù)據(jù)庫開發(fā)項(xiàng)目的一個(gè)來源。理或進(jìn)行更精確的銷售預(yù)測(cè)。然而許多數(shù)據(jù)庫開發(fā)項(xiàng)目更多的是以自底向上的方式。個(gè)項(xiàng)目，又如其他信息系統(tǒng)的專家發(fā)現(xiàn)組織需要改進(jìn)數(shù)據(jù)管理而開始新的項(xiàng)目。然而在大多數(shù)情況下，數(shù)據(jù)庫及其相關(guān)信息處理功能是作為一。的關(guān)系，概念數(shù)據(jù)建模發(fā)生在兩個(gè)系統(tǒng)開發(fā)生命周期階段之間。企業(yè)建模發(fā)生在信息系統(tǒng)規(guī)劃和其他活。在分析階段，還要檢查概念數(shù)據(jù)模型與用來。然而，即使是這樣詳細(xì)的概念數(shù)據(jù)模型也只是初步的，因?yàn)楹罄m(xù)。當(dāng)報(bào)表、事務(wù)等被分析時(shí)有可能根據(jù)需要而改變概念數(shù)據(jù)模型。信息處理需求，此時(shí)這些新的需求必須集成到前面確定的邏輯數(shù)據(jù)庫設(shè)計(jì)中。設(shè)計(jì)人員可以使用標(biāo)準(zhǔn)。在運(yùn)轉(zhuǎn)期間，定期備份數(shù)據(jù)庫，并當(dāng)數(shù)據(jù)庫損壞或受到影響時(shí)恢復(fù)數(shù)據(jù)庫。數(shù)據(jù)庫在數(shù)據(jù)庫維護(hù)期間逐漸發(fā)展。這一步通常是數(shù)據(jù)庫開發(fā)過程中最長(zhǎng)的一步，因?yàn)樗掷m(xù)數(shù)據(jù)庫及相
【正文】 other means System Development Life Cycle minor changes in law or its variant of the often used to guide information systems and database development. Information System is a lifecycle methodology, it is highly structured approach, which includes many checks and balances to ensure that every step of produce accurate results, and new or alternative information system and it must munications or data definitions consistent existing system needs consistency. System development life cycle because of the regular need to have a working system for a long time been criticized because only work in the system until the end of the whole process generated. More and more organizations now use rapid application development method, it is a includes analysis, design and implementation of steps to repeat the rapid iterative process until convergence to users the system so far. Rapid Application Development Act required the database has been in existence, and enhance system is mainly to the application of data retrieval application, but not to those who generate and modify database applications. The most widely used method of rapid application development is one of the prototype. The prototype system is a method of iterative development process, analysts and users through close cooperation, continuing to revise the system will eventually convert all the needs of a working system. In this diagram we contains notes, briefly describes each stage of the prototype of the database development activities. Normally, when information systems problems were identified, tried only a rough concept of data modeling. In the development of the initial prototype, the design of the user wants to display and statements, and that any new database needs and define a term prototype database. This is usually a new database, copy the part of the existing system, but might also added some new content. When the need for new content, these elements are usually from external data sources, such as market research data, the general economic indicators or industry standards. When a prototype of a new version to repeat the achievement and maintenance of database activities. Usually only a minimum level of security and integrity control, because at this time the focus is as soon as possible to produce a prototype version can be used. But document management project also deferred to the final, only be used in the delivery of user training. Finally, once constructed an acceptable prototype, developers, and users will be the final decision of whether to prototype delivery and the use of the database. If the system (including database) efficiency is very low, then the system and database will be reprogramming and reorganization in order to achieve the desired performance. Along with visual programming tools (such as Visual Basic, Java, Visual C + + and fourth generation language) increasingly popular use of visual programming tools can easily change the user interface with the system, the prototype is being the choice of system development methodology. Customers using the prototype method statements and show changes to the content and layout is quite easy. In the process, the new database needs were identified, so it is the development of the use of the existing database should be amended. There is even the possibility of a need for a new database system prototype method, in such circumstances, when the system demand in the iterative process of development in the everchanging needs access to sample data, the construction or reconstruction of the database prototype.
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