Oracle Distributed Systems


Автор: Charles Dye
ИздательствоO'Reilly Media

Год: 1999
Страниц: 552
ФорматПечатный (отличное, отсканированный текст)
ISBN: 978-1-56592-432-1








Any organization that uses the Oracle relational database management system (RDBMS) these days needs to use multiple databases. There are many reasons to use more than a single database in a distributed database system:

· Different databases may be associated with particular business functions, such as manufacturing or human resources.

· Databases may be aligned with geographical boundaries, such as a behemoth database at a headquarters site and smaller databases at regional offices.

· Two different databases may be required to access the same data in different ways, such as an order entry database whose transactions are aggregated and analyzed in a data warehouse.

· A busy Internet commerce site may create multiple copies of the same database to attain horizontal scalability.

· A copy of a production database may be created to serve as a development test bed.

In a distributed database environment, data in two or more databases is accessible as if it were in a single database. Usually, the different databases are on different servers, which may be located at the same site or a continent away. Communication between the servers takes place via SQLNet (for Oracle7) or Net8 (for Oracle8).Distributed database environments offer a number of benefits over single- database systems, including:

· Tunability

· Platform autonomy

· Fault tolerance

· Scalability

· Location transparency

· Site autonomy

This book describes how you can use multiple databases and the distributed features of Oracle to best advantage. It covers:Table of contents:

Part I: The Distributed System

· Introduction to Distributed Database Systems


Net and Net8

· Configuration and Administration

· Distributed Database Security

· Designing the Distributed System

· Oracle's Distributed System Implementation

· Sample Configurations 8. Engineering Considerations

Part II: Replication

· Oracle Replication Architecture

· Advanced Replication Option Installation

· Basic Replication

· Multi-Master Replication

· Updateable Snapshots

· Procedural Replication

· Conflict Avoidance and Resolution Techniques

Part III: Appendixes

Appendix A: Built-in Packages for Distributed Systems


Appendix B: Scripts


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