Dbms

Information Integration

As information becomes ever more important in our work and play, we find that existing information resources are being used in many new ways. For instance, consider a company that wants to provide on-line catalogs for all its products

Overview of a Database Management System

In following Figure we see an outline of a complete DBMS. Single boxes represent system components, while double boxes represent in-memory data structures.

Transaction Processing

It is normal to group one or more database operations into a transaction, which is a unit of work that must be carried out atomically and in obvious separation from other transactions. In addition

Database System Implementation

The subject of database system implementation can be divided roughly into three parts: 1. Storage management: how secondary storage is used effectively to hold data and allow it to be accessed quickly.

Information Integration Overview

Much of the recent development of database systems has been toward capabilities that allow different data sources, which may be databases and / or information resources that are not managed by a DBMS

The Entity-Relationship Data Model

The procedure to design a database starts with an analysis of what information the database must hold and what are the relationships among elements of that information. Often, the structure of the database, called the database schema, is specified in one of several

Review of Object-Oriented Concepts

Before introducing object-oriented database models, let us review the main object-oriented concepts themselves. Object-oriented programming has been extensively regarded as a tool for better program organization and, finally, more reliable software implementation.

Declaring Keys in ODL

ODL is different from the other models studied so far in that the declaration and use of keys is optional. That is, in the E/R model, entity sets require keys to distinguish members of the entity set from one another. In the relational model, where relations are sets, all attributes

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