Oracle Distributed Systems. Includes Diskette - Brossura

Dye, Charles

Brossura

ISBN 10: 1565924320 ISBN 13: 9781565924321

Casa editrice: O'Reilly, 1999

Riassunto

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
• SQL

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: AppendixesAppendix A: Built-in Packages for Distributed Systems Appendix B: Scripts

Su questo libro

L'autore

Charles Dye is the database architect for Excite, Inc. (www.excite.com), where he is responsible for the design and implementation of the databases theat supply content to some of the world's busiest Web sites. Prior to joining Excite, he was the senior database administrator for The Dialog Corporation. Charles also operates a small but growing consultancy with clients in the San Francisco Bay area and Hong Kong. Once upon a time, before fleeing the East Coast for California skies, Charles taught math and physics at the Georgetown Day School in Washington DC. Charles is a frequent speaker at regional and national Oracle events such as Oracle Open World and IOUG-A Live. His favorite topics are distributed databases in general and advanced replication in particular. He also writes for the Northern California Oracle Users Group newsletter and is an active contributor to the Oracle Internet list server. Look for Charles' upcoming O'Reilly book, Oracle Distributed Systems, available later in 1998. Charles lives in Los Altos, California, with his wife Kathy, daughter Natalie, and labrador Jed. You can email him at cdye@excite.com.

Contenuti

Preface; Audience for This Book; About Replication; About Oracle Versions and Platforms; Structure of This Book; Conventions Used in This Book; About the Scripts; Comments and Questions; Acknowledgments; The Distributed System; Chapter 1: Introduction to Distributed Systems; 1.1 Terminology and Concepts; 1.2 What Is a Distributed Database System?; 1.3 Benefits of Distributed Databases; 1.4 Multiple Schema Versus Multiple Databases; 1.5 Options for Distributed Data; 1.6 Perils of Distributed Databases; 1.7 Differences Between Oracle7 and Oracle8; Chapter 2: SQL*Net and Net8; 2.1 Protocol Overview; 2.2 Architecture; 2.3 SQL*Net/Net8 Tuning; 2.4 Load Balancing; 2.5 Oracle8 Scalability Options; 2.6 SQL*Net/Net8 Client Configuration; 2.7 SNMP Support; 2.8 Security; Chapter 3: Configuration and Administration; 3.1 Initialization Parameters; 3.2 Database Links; 3.3 Distributed Queries and Transactions; 3.4 Distributed Backup and Recovery; 3.5 Multiversion Interoperability; Chapter 4: Distributed Database Security; 4.1 Privilege Management; 4.2 Authentication Methods; Chapter 5: Designing a Distributed System; 5.1 Characteristics of a Distributed System; 5.2 The Global Data Dictionary; 5.3 Replication-Specific Issues; 5.4 Data Partitioning Methodologies; 5.5 Application Partitioning Strategies; 5.6 Procedural Replication; Chapter 6: Oracle’s Distributed System Implementation; 6.1 Meeting the 12 Objectives with Oracle; 6.2 Oracle’s Global Data Dictionary; Chapter 7: Sample Configurations; 7.1 The High-Availability System; 7.2 Geographic Data Distribution; 7.3 Workflow Partitioning; 7.4 Data Collection and Consolidation; 7.5 Loosely Coupled Federation; Chapter 8: Engineering Considerations; 8.1 Schema Design and Integration; 8.2 Application Tiering; 8.3 Designing a Replicated System; Replication; Chapter 9: Oracle Replication Architecture; 9.1 What Is Oracle Replication?; 9.2 Types of Replication; 9.3 Architecture Components; 9.4 Replication of DDL; 9.5 Oracle8 Enhancements; 9.6 Oracle8i Enhancements; 9.7 Alternatives to Replication; Chapter 10: Advanced Replication Installation; 10.1 Initialization Parameters; 10.2 Redo Logs and Rollback Segments; 10.3 Size and Placement of Data Dictionary Objects; 10.4 Administrative Accounts, Privileges, and Database Links; Chapter 11: Basic Replication; 11.1 About Read-Only Snapshots; 11.2 Prerequisites and Restrictions; 11.3 Snapshot Creation Basics; 11.4 Simple Versus Complex Snapshots; 11.5 Snapshot Logs; 11.6 Subquery Subsetting; 11.7 Refresh Groups; 11.8 Management and Optimization; 11.9 Scripts; Chapter 12: Multi-Master Replication; 12.1 Concepts and Terminology; 12.2 Getting Started; 12.3 Replication Groups; 12.4 Master Site Maintenance and Propagation; 12.5 Controlling Propagation; 12.6 The Replication Catalog; 12.7 Table Replication; 12.8 Replicating DDL; 12.9 Your Replicated Environment; 12.10 Advanced Replication Limitations; Chapter 13: Updateable Snapshots; 13.1 About Updateable Snapshots; 13.2 Creating Updateable Snapshots; 13.3 Communication Flow; 13.4 Controlling Propagation and Refreshes; 13.5 Maintenance; Chapter 14: Procedural Replication; 14.1 When to Use Procedural Replication; 14.2 How Procedural Replication Works; 14.3 Creating a Replicated Package Procedure; 14.4 Restrictions on Procedural Replication; 14.5 An Example; Chapter 15: Conflict Avoidance and Resolution Techniques; 15.1 Data Integrity Versus Data Convergence; 15.2 Applications That Avoid Conflicts; 15.3 Types of Conflicts Detected; 15.4 How Oracle Detects and Resolves Conflicts; 15.5 Column Groups and Priority Groups; 15.6 The Built-in Methods; 15.7 Writing Your Own Conflict Resolution Handler; Appendixes; Built-in Packages for Distributed Systems; DBMS_DEFER: Building Deferred Calls; DBMS_DEFER_QUERY: Performing Diagnostics and Maintenance; DBMS_DEFER_SYS: Managing Deferred Transactions; DBMS_OFFLINE_OG: Performing Site Instantiation; DBMS_OFFLINE_SNAPSHOT: Performing Offline Snapshot Instantiation; DBMS_RECTIFIER_DIFF: Comparing Replicated Tables; DBMS_REFRESH: Managing Snapshot Groups; DBMS_REPCAT: Performing Replication Administration; DBMS_REPCAT_ADMIN: Setting Up Administrative Accounts; DBMS_REPCAT_AUTH: Setting Up More Administrative Accounts; DBMS_REPUTIL: Enabling and Disabling Replication; DBMS_SNAPSHOT: Managing Snapshots; Scripts and Utilities; busycirc.sql; busydisp.sql; busyq.sql; checklatency; colgroups.sql; confstats.sql; cr_regions.sql; defcall.sql; defcalldest.sql; defcallinfo.sql; defdest.sql; deferror.sql; deferror8.sql; deforigin.sql; defschedule.sql; deftran.sql; deftrandest.sql; disprate.sql; errorinfo.sql; fixdefer.sql; gendelerrtran.sql; gendeltran.sql; gengensup.sql; groupedcols.sql; invalids.sql; jobs.sql; keycols.sql; lastsnap.sql; latent.sql; links.sql; mastersnapinfo.sql; mlogs.sql; needsgen.sql; nonrepobjects.sql; pk_regions.sql; prioritygroups.sql; prioritysites.sql; propmode.sql; refgroups.sql; regsnaps.sql; repcaterr.sql; repcatlog.sql; repconflict.sql; repgroup.sql; repobjects.sql; repres.sql; repsites.sql; resconfs.sql; snaps.sql; snaps7.sql; trg_regions.sql; UserAdmin; Colophon;

Dettagli dell?edizione

• Editore: O'Reilly
• Data di pubblicazione: 1999
• ISBN 10: 1565924320
• ISBN 13: 9781565924321
• Rilegatura: Copertina flessibile
• Lingua: Inglese
• Numero di pagine: 530