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There are several types of database management systems, categorized

Written on 2016-07-04 09:27:23 By Billy










should be represented by a single instance only. Higher degrees of normalization typically involve more tables and create the need for a larger number of joins, which can reduce performance. Accordingly, more highly normalized tables are typically used in database applications involving many isolated transactions

(e.g. an Automated teller machine), while less normalized tables tend to be used in database applications that do not need to map complex relationships between data entities and data attributes (e.g. a reporting application, or a full-text search application).

2.5 HIERARCHICAL VERSUS RELATIONAL DATABASE
2.5.1 Introduction

There are several types of database management systems, categorized generally by how they logically store and retrieve data. The two most common types in use today are relational and hierarchical. Each type has its advantages and disadvantages, and in many organizations both types are used. Whether you choose a relational or hierarchical database management system depends largely on how you intend to use the data being stored.

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