File Name: essential aspects of physical design and implementation of relational databases .zip
A database is an organized collection of data , generally stored and accessed electronically from a computer system.
A properly designed database provides you with access to up-to-date, accurate information. Because a correct design is essential to achieving your goals in working with a database, investing the time required to learn the principles of good design makes sense. In the end, you are much more likely to end up with a database that meets your needs and can easily accommodate change. This article provides guidelines for planning a desktop database.
Database Design - 2nd Edition
System design is the phase that bridges the gap between problem domain and the existing system in a manageable way. This phase focuses on the solution domain, i. It is the phase where the SRS document is converted into a format that can be implemented and decides how the system will operate. In this phase, the complex activity of system development is divided into several smaller sub-activities, which coordinate with each other to achieve the main objective of system development. Proposed system requirements including a conceptual data model, modified DFDs, and Metadata data about data.
Relational database systems underpin the majority of the managed data storage in computer systems. This course presents an overview of the development life cycle for a database system and highlights how the database development differs from traditional software development. In this course we look at an outline of the stages involved in the development of a database. We consider the broader issue of how to decide what should be in a database and how to structure the tables that should be included. Our aim is to give you a basic development method so that you can see how a basic database system is developed. We don't argue that this specific method is the most applicable to any given situation — however, we do consider that this method is straightforward and will allow you to contextualise or, by comparison, consider a range of database development techniques.
Database design basics
A relational database management system RDBMS stores and retrieves data that is represented in tables. A relational database consists of a collection of tables that store interrelated data. This section introduces some of the terms and concepts that are important in talking about relational databases. In a relational database, all data is held in tables , which are made up of rows and columns. Each table has one or more columns, and each column is assigned a specific datatype , such as an integer number, a sequence of characters for text , or a date. Each row in the table has a value for each column.
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Database design is the organization of data according to a database model. The designer determines what data must be stored and how the data elements interrelate. With this information, they can begin to fit the data to the database model. Database design involves classifying data and identifying interrelationships. This theoretical representation of the data is called an ontology.
However, getting from the relational data model to the physical model for a particular DBMS and implementing the database is less direct and often require trying.
Relational database systems underpin the majority of the managed data storage in computer systems. This course presents an overview of the development life cycle for a database system and highlights how the database development differs from traditional software development. In this course we look at an outline of the stages involved in the development of a database. We consider the broader issue of how to decide what should be in a database and how to structure the tables that should be included.