database design :: essays research papers

Database conceptScenarioCurrently a rail uses a non-computerised infobase system to store the avocation information about its school-age childs roll class, surname, first name, guardians name, address, disciples date of birth, gender, sport house, emergency-contact telecommunicate add up, mailing name, list of subjects offered, and subjects in which the student is enrolled. The system takes up a large amount of space, has many duplicated entries some of these with mistakes and it is quantify consuming to search. The school intends to introduce a relational-database management system to overcome these problems.Current school data storage and retrieval system (the pre-computer database system)h School module, teachers and blank space round are the users of the database.h Database used to track all detail of students in the school.h Large amounts of data are stored. An individual interpret is choosed for each student. h Lots of extra exists as enlarge of subjects off ered by the school are duplicated on 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 origin 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 nominal number of staff can nark records at one timeh data is duplicated.Stages of development of the computerised relational database system The new computerised relational database system bequeath be developed in the following stagesh analysish designh implementationh careAnalysisIn this stage the current system is analysed to determine the functions it performs and those that it is inefficient 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 inflexibleh current storage space of student records needs to lighth 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 Principal need to have access to the database simultaneously - read access only is required