The core issue in database application systems is "database design". A core issue in database application systems is to design a database that can meet user requirements and have good performance. This is database design. The design content of database design includes: demand analysis, conceptual structure design, logical structure design, physical structure design, database implementation and database operation and maintenance.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
The core issue in database application systems is "database design".
One of the core issues in database application systems is to design a database that can meet user requirements and have good performance. This is database design, so database design is the core of database applications.
Database Design refers to constructing the optimal database model for a given application environment, establishing the database and its application system, so that it can effectively store data and meet the applications of various users. Requirements (information requirements and processing requirements). In the field of databases, various systems that use databases are often collectively referred to as database application systems.
Importance
1. Conducive to resource conservation
Many computer software designs pay too much attention to the functional modules of computer software, but do not comprehensively, Comprehensive analysis of database design often leads to frequent low performance and various types of failures during actual operation of the software, and may even lead to a series of safety hazards such as power leakage and system crashes. Therefore, paying attention to the design of computer software databases can not only reduce the later maintenance of the software and save manpower and material resources, but also facilitate the efficient use of software functions.
2. It is conducive to the improvement of software running speed
High-level database design can meet the running speed requirements of different computer software systems, and can also fully utilize and realize system functions. After the performance of computer software is improved, the operating instructions issued by the system will be faster and more effective in providing information to users, and the software running speed will naturally be improved. In addition, the scalable database design can help users save time in operating the software [1]. In the database design process, using its information storage function can improve the query efficiency of the system by clearing some unnecessary databases. In addition to the above functions, software designers can also carry out effective database design based on software functional requirements, thereby ensuring that the database can effectively play its role in the operation of computer software.
3. Conducive to reducing software failures
When designing databases, some designers’ design steps are too complicated and they do not conduct effective analysis of the software itself, which will inevitably lead to computer software Unable to perform its functions effectively. On the other hand, the lack of effective design log information will also lead to a series of failures during software operation, making it difficult for users to modify some erroneous operations. Therefore, strengthening database design can effectively reduce the probability of software failures and promote the realization of computer software functions.
The design content of database design includes: Requirements analysis, conceptual structure design, logical structure design, physical structure design, database implementation and database operation and maintenance.
Design principles
1. One-to-one design principle
In the software development process, it is necessary to follow the one-to-one relationship design principle to develop data Maintenance work, by using this principle, the occurrence of maintenance problems can be minimized, ensuring the smooth progress of data maintenance work and reducing the difficulty of maintenance work. During this process, try to avoid large and complex data, otherwise it will not only affect the progress of software development, but also increase the difficulty of work and affect the quality of its products. Therefore, design staff must pay attention to this issue. At the same time, we fully understand the inevitable connections between entities to achieve the goal of information data dispersion. On this basis, we can improve the work efficiency of the overall staff and improve the reliability, scientificity, security and performance of software applications.
2. Unique Naming Principle
The application of unique naming principle is to reduce the phenomenon of repeated naming and standardized naming in the database design process. By applying this principle, data redundancy can be reduced, data consistency can be maintained, and there must be a certain corresponding relationship between keywords. The unique naming principle can train staff to be proficient in uppercase and lowercase letters, and is conducive to standardizing the development of back-end code work.
3. Two-way usage principle
The two-way usage principle includes: transaction usage principle and index function principle. First of all, the two-way usage principle is implemented based on the logical work unit model, which not only provides basic guarantee for non-transactional unit operations, but also ensures that it can update and obtain data resources in a timely manner. The effective application of the index function principle enables it to obtain more attribute column data information and flexibly sort it. Currently, common indexing modes in the software market include: clustered index for multi-row retrieval and non-clustered index for single-row retrieval.
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