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Oracle Directory Server Enterprise Edition Administration Guide 11g Release 1 (11.1.1.5.0) |
Part I Directory Server Administration
2. Directory Server Instances and Suffixes
3. Directory Server Configuration
6. Directory Server Access Control
7. Directory Server Password Policy
8. Directory Server Backup and Restore
9. Directory Server Groups, Roles, and CoS
10. Directory Server Replication
13. Directory Server Attribute Value Uniqueness
Overview of Attribute Value Uniqueness
Enforcing Uniqueness of the uid and Other Attributes
To Enforce Uniqueness of the uid Attribute
To Enforce Uniqueness of Another Attribute
15. Directory Server Monitoring
Part II Directory Proxy Server Administration
16. Directory Proxy Server Tools
17. Directory Proxy Server Instances
19. Directory Proxy Server Certificates
20. Directory Proxy Server Load Balancing and Client Affinity
21. Directory Proxy Server Distribution
22. Directory Proxy Server Virtualization
23. Virtual Data Transformations
24. Connections Between Directory Proxy Server and Back-End LDAP Servers
25. Connections Between Clients and Directory Proxy Server
26. Directory Proxy Server Client Authentication
27. Directory Proxy Server Logging
28. Directory Proxy Server Monitoring and Alerts
Part III Directory Service Control Center Administration
The UID uniqueness plug-in does not perform any checking on attribute values when an update is performed as part of a replication operation. This does not affect single-master replication, but the plug-in cannot automatically enforce attribute uniqueness for multimaster replication.
Because all modifications by client applications are performed on the master replica, the UID uniqueness plug-in should be enabled on the master server. The plug-in should be configured to enforce uniqueness in the replicated suffix. Because the master ensures that the values of the desired attribute are unique, you do not need to enable the plug-in on the consumer server.
Enabling the UID uniqueness plug-in on the consumer of a single master does not interfere with replication or normal server operations. However, it might cause slight performance degradation.
The UID uniqueness plug-in was not designed for use in a multimaster replication scenario. Because multimaster replication uses a loosely consistent replication model, simultaneously adding the same attribute value on both servers will not be detected, even if the plug-in is enabled on both servers.
However, you can use the UID uniqueness plug-in if the attribute on which you are performing the uniqueness check is a naming attribute, and the uniqueness plug-in is enabled for the same attribute in the same subtrees on all masters.
When these conditions are met, uniqueness conflicts are reported as naming conflicts at replication time. Naming conflicts must be resolved manually. For more information, refer to Solving Common Replication Conflicts.