TAILIEUCHUNG - Beginning Database Design- P3

Beginning Database Design- P3:This book focuses on the relational database model from a beginning perspective. The title is, therefore, Beginning Database Design. A database is a repository for data. In other words, you can store lots of information in a database. A relational database is a special type of database using structures called tables. Tables are linked together using what are called relationships. You can build tables with relationships between those tables, not only to organize your data, but also to allow later retrieval of information from the database | Database Modeling Past and Present Figure 1-9 The object database model. Another benefit of the object database model is its inherent ability to manage and cater for extremely complex applications and database models. This is because of a basic tenet of object methodology whereby highly complex elements can be broken down into their most basic parts allowing explicit access to as well as execution against and within those basic parts. In other words if you can figure out how all the little pieces work individually it makes the big picture complex by itself a combination of a number of smaller much simpler constituent pieces. A discussion of the object database model in a book covering the relational database model is important because many modern applications are written using object methodology based SDKs such as Java. One of the biggest sticking points between object programmed applications and relational databases is the performance of the mapping process between the two structural types object and relational. Object and relational structure is completely different. It is therefore essential to have some understanding of object database modeling techniques to allow development of efficient use of relational databases by object-built applications. 13 Chapter 1 Object-Relational Database Model The object database model is somewhat spherical in nature allowing access to unique elements anywhere within a database structure with extremely high performance. The object database model performs extremely poorly when retrieving more than a single data item. The relational database model on the other hand contains records of data in tables across two dimensions. The relational database model is best suited for retrieval of groups of data but can also be used to access unique data items fairly efficiently. The object-relational database model was created in answer to conflicting capabilities of relational and object database models. Essentially object database modeling .

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