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Tham khảo tài liệu 'databases demystified- p4', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Databases Demystified the life cycle of the entire systems-development effort and the way projects are organized and managed. In this chapter we take a look at both traditional and nontradi-tional systems-development processes. Not all databases are built by businesses using formal projects and funding. However the disciplines outlined in this chapter can assist you in thinking through your database project asking the tough questions before you embark on an extended effort. The Traditional Method The traditional method for developing computer systems follows a process called the system development life cycle SDLC which divides the work into the phases shown in Figure 5-1. There are perhaps as many variations of the SDLC as there are authors project management software vendors and companies that have elected to create their own methodology. However they all have the basic components and in that sense are all cut from the same cloth. We could argue the merits of one variation versus another but that would merely confuse matters when all we need is a basic overview. A good textbook on systems analysis can provide greater detail should you need it. Figure 5-1 shows the traditional SDLC steps in the left column the basic project activities in the middle column and the database steps that support the project activities in the right column. We will explore each step further in the sections that follow. Note that the process is not always unidirectional there are times when missing or incomplete information is discovered that requires you to go back one phase and adjust the work done there. The dotted lines pointing back to prior phases in Figure 5-1 serve as a reminder that a certain amount of rework is normal and expected during a project following the SDLC methodology. Planning During the planning phase the organization must reach an understanding at a high level of where they currently are where they want to be and a reasonable approach or plan for getting from one .
