Oracle Database Global Data Services provides dynamic load balancing, failover, and centralized service management for a set of replicated databases that offer common services. The set of databases can include an Oracle Sharding architecture, Oracle Real Application Clusters (Oracle RAC) and noncluster Oracle databases interconnected through Oracle Data Guard, Oracle GoldenGate, or any other replication technology.

This Preface contains these topics:



This document is intended for database administrators, Architects, and engineers who manage replicated databases.

Documentation Accessibility

For information about Oracle's commitment to accessibility, visit the Oracle Accessibility Program website at

Access to Oracle Support

Oracle customers that have purchased support have access to electronic support through My Oracle Support. For information, visit or visit if you are hearing impaired.


The following text conventions are used in this document:

Convention Meaning


Boldface type indicates graphical user interface elements associated with an action, or terms defined in text or the glossary.


Italic type indicates book titles, emphasis, or placeholder variables for which you supply particular values.


Monospace type indicates commands within a paragraph, URLs, code in examples, text that appears on the screen, or text that you enter.