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Oracle Fusion Middleware Architecture Reference for Oracle Unified Directory 11g Release 1 (11.1.1)
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Document Information


1.  Introduction

2.  The Directory Server Access Control Model

3.  Understanding the Directory Server Schema

4.  Directory Server Index Databases

5.  Directory Server Replication

Overview of the Directory Server Replication Architecture

Basic Replication Architecture

Replication Servers

Replication Change Numbers

Replication Server State

Operation Dependencies

How Replication Works

Replication Initialization

Directory Server Change Processing

Replication Server Selection

Replication Server Selection Algorithm

Replication Server Load Balancing

Change Replay

Auto Repair

Directory Server Crashes

Replication Server Crashes

Historical Information and Conflict Resolution

What is a Replication Conflict?

Resolving Modify Conflicts

Resolving Naming Conflicts

Purging Historical Information

Schema Replication

Schema Replication Architecture

Replication Status

Replication Status Definitions

Degraded Status

Full Update Status and Bad Generation ID Status

Replication Groups

Assured Replication

Assured Replication Modes

Safe Data Mode

Safe Read Mode

Safe Read Mode and Replication Groups

Assured Replication Connection Algorithm

Assured Replication and Replication Status

Assured Replication Monitoring

Fractional Replication

Fractional Data Set Identification

Fractional Replication Filtering

Fractional Replication and Local Operations

External Change Log

How the External Change Log Works

Porting Applications That Rely on Other Change Logs

Differences Between the ECL and the LDAP Change Log Draft

Index Differences

DIT and Schema Differences

Additional Differences Between the ECL and the Oracle Directory Server Enterprise Edition Retro Change Log

API for Compatibility With the LDAP Change Log Draft and the Oracle Directory Server Enterprise Edition Retro Change Log

Limitations of the Compability API

6.  Directory Server Root Users and the Privilege Subsystem

7.  Supported Controls and Operations

Replication Groups

Replication groups are designed to support multi-data center deployments and disaster recovery scenarios. Replication groups are defined by a group ID. A group ID is a unique number that is assigned to a replicated domain on a directory server (one group ID per replicated domain). A group ID is also assigned to a replication server (one group ID for the whole replication server).

Group IDs determine how a directory server domain connects to an available replication server. From the list of configured replication servers, a directory server first tries to connect to a replication server that has the same group ID as that of the directory server. If no replication server with a compatible group ID is available, the directory server connects to a replication server with a different group ID. This selection process is described in greater detail in the following section.

For information about how to configure replication groups, see Configuring Replication Groups in Oracle Fusion Middleware Administration Guide for Oracle Unified Directory.

Note - Assured replication does not cross group boundaries. For more information, see Assured Replication.