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外文原文
Databa Development Process
初一英语课本Bad on information engineering information systems planning databa is a source of development projects. The new databa development projects is usually in order to meet the strategic needs of organizations, such as improving customer support, improve product and inventory management, or a more accurate sales forecast. However, many more databa development project is the bottom-up approach emerging, such as information system ur needs specific information to complete their work, thus beginning a project request, and as other information systems experts found that organizations need to improve data management and begin new projects. Bottom-up even in the circumstances, to t replace
up an enterpri data model is also necessary to understand the existing databa can provide the necessary data, otherwi, the new databa, data entities and attributes can be added to the current data resources to the organization.
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Both the strategic needs or operational information needs of each databa development projects normally concentrated in a databa. Some projects only concentrated in the databa definition, design and implementation of a databa, as a follow-up to the basis of the development of information systems. However, in most cas, the databa and associated information processing function as a complete information systems development project was part of the development.
onecontribution.dominate翻译 System Development Life Cycle
Guide management information system development projects is the traditional process of system development life cycle (SDLC). System development life cycle is an organization of the databa designers and programmers information system compod of the Panel of Experts detailed description, development, maintenance 休闲服饰搭配
and replacement of the entire information system steps. This process is becau Waterfall than for every step into the adjacent the next step, that is, the information system is a specification developed by a piece of land, every piece of the output is under an input. However shown in the figure, the steps are not purely linear, each of the steps overlap in time (and thus can manage parallel steps), but when the need to reconsider previous decisions, but also to roll back some steps ahead. (And therefore water can be put back in the waterfall!)
The system development life cycle including each stage and databa development-related activities, therefore, the question of databa management systems throughout the entire development process. In Figure 5 we repeat of the system development life cycle stage of the ven, and outlines the common databa at each stage of development activities. Plea note that the systems development life cycle stages and databa development steps exists between the relationship between the concept of modeling data in both systems development life cycle stages between.德语发音
1.1 Enterpri Modeling
Databa development process from the enterpri modeling (system development life cycle stage of the project feasibility studies, and to choo a part)
Organizations t the scope and general databa content. Enterpri modeling in information systems planning and other activities, the activities determine which part of information systems need to change and strengthen the entire organization and outlines the scope of data. In this step, check the current databa and information systems, development of the project as the main areas of the nature of the business, with a very general description of each term in the development of information systems when needed data. Each item only when it achieved the expected goals of organizations can be when the next step.
1.2 Conceptual Data Modeling
be cruel to be kind
One has already begun on the Information System project, the concept of data mo
deling pha of the information systems needs of all the data. It is divided into two stages. First, it began the project in the planning stage. At the same time outlining the establishment of other documents to the existing databa without considering the circumstances specific development projects in the scope of the required data. This category only includes high-level data (entities), and main contact. Then in the system development life-cycle analysis stage must have a management information system t the entire organization Details of the data model definition of all data attributes, listing all data types that all data inter-entity business linkages, defining description of the full data integrity rules. In the analysis pha, but also the concept of inspection data model (also called the concept behind the model) and the goal of information systems ud to explain other aspects of the model of consistency categories, such as processing steps, rules and data processing time of timing. However, even if the concept is such detailed data model is only preliminary, becau follow-up information system life cycle activities in the design of rvices, statements, display and inquiries may find that
美国billboard排行榜missing element or mistakes. Therefore, the concept of data often said that modeling is a top-down manner, its areas of operation from the general understanding of the driver, rather than the specific information processing activities by the driver.
