database design :: essays research papers

Database DesignScenarioCurrently a school uses a non-computerised infobase system to store the quest nurture about its students roll class, surname, first name, guardians name, address, students date of birth, gender, sport house, emergency-contact telephone number, mailing name, list of subjects offered, and subjects in which the student is enrolled. The system takes up a large gist of space, has many duplicated entries some of these with mistakes and it is time consuming to search. The school intends to introduce a relational-database management system to overcome these problems.Current school data storage and recovery system (the pre-computer database system)h School round, teachers and office lag be the users of the database.h Database used to track all details of students in the school.h Large amounts of data are stored. An several(prenominal) record is required for each student. h Lots of duplication exists as details of subjects offered by the school are duplicated o n individual student records.h Data is organised in alphabetical order on student names within years.h Data is stored in a number of filing cabinets.Advantagesh quick to find details of a student if year and surname are knownh data is stored in a central secure locationh original source material is stored in the student file.Disadvantagesh slow to find details of students when surname and year are not knownh data storage takes up a lot of roomh minimal number of staff can access records at one timeh data is duplicated.Stages of development of the computerised relational database system The new computerised relational database system will be developed in the following stagesh analysish designh implementationh maintenanceAnalysisIn this stage the authentic system is analysed to determine the functions it performs and those that it is unable to perform. Direct and indirect users of the new system are interviewed to determine what they require from the new system. The inputs to the new system, the processes it is to perform and the outputs from the system are clearly defined. A recommendation is made about the type of new system that will be required to meet the identified needs.During the analysis stage, the following is determinedh current storage space of student records needs to decreaseh an easily update-able backup of student records is required, h one staff member is to be responsible for the administration of the system, h unnecessary duplication of data is to be avoided, h all teaching staff, office staff and the trail need to have access to the database simultaneously - read access only is required