Chapter 1.  Introduction

Table of Contents

An introduction to data management
Mapping the terrain: theory and practice
Data access and data management
Relational databases
Object-oriented databases
Network databases
Clients and servers
What is Berkeley DB?
Data Access Services
Data management services
What Berkeley DB is not
Not a relational database
Not an object-oriented database
Not a network database
Not a database server
Do you need Berkeley DB?
What other services does Berkeley DB provide?
What does the Berkeley DB distribution include?
Where does Berkeley DB run?
The Berkeley DB products
Berkeley DB Data Store
Berkeley DB Concurrent Data Store
Berkeley DB Transactional Data Store
Berkeley DB High Availability

An introduction to data management

Cheap, powerful computing and networking have created countless new applications that could not have existed a decade ago. The advent of the World-Wide Web, and its influence in driving the Internet into homes and businesses, is one obvious example. Equally important, though, is the shift from large, general-purpose desktop and server computers toward smaller, special-purpose devices with built-in processing and communications services.

As computer hardware has spread into virtually every corner of our lives, of course, software has followed. Software developers today are building applications not just for conventional desktop and server environments, but also for handheld computers, home appliances, networking hardware, cars and trucks, factory floor automation systems, and more.

While these operating environments are diverse, the problems that software engineers must solve in them are often strikingly similar. Most systems must deal with the outside world, whether that means communicating with users or controlling machinery. As a result, most need some sort of I/O system. Even a simple, single-function system generally needs to handle multiple tasks, and so needs some kind of operating system to schedule and manage control threads. Also, many computer systems must store and retrieve data to track history, record configuration settings, or manage access.

Data management can be very simple. In some cases, just recording configuration in a flat text file is enough. More often, though, programs need to store and search a large amount of data, or structurally complex data. Database management systems are tools that programmers can use to do this work quickly and efficiently using off-the-shelf software.

Of course, database management systems have been around for a long time. Data storage is a problem dating back to the earliest days of computing. Software developers can choose from hundreds of good, commercially-available database systems. The problem is selecting the one that best solves the problems that their applications face.