Directory Replication Concepts, 6 of 12

Replication Agreements

A replication agreement is a special entry containing information about the relationship among servers in a DRG. In Oracle Internet Directory, all such entries reside under the container entry cn=replication configuration located at the root DSE. This entry resides on each node in a DRG, and contains all replication information for that node.

There are two kinds of replication agreements: those for multimaster replication groups, and those for single-master replication groups.

This section contains these topics:

Multimaster Replication Agreements

For a multimaster replication group, replication agreements are based on Oracle9i Advanced Replication. The replication agreement on each node lists all of the nodes in the group. It is identical on each node except for local options such as partitioned naming contexts on the local directory server.

The entry for this kind of replication agreement resides immediately below the cn=replication configuration container entry. For example, the DN of such an agreement can look like this: orclagreementID=000001,cn=replication configuration.

Single-Master Replication Agreements

Unlike replication agreements for multimaster replication groups, replication agreements for single-master replication groups are LDAP-based. For each fan-out replication group there is one replication agreement for each supplier-consumer relationship.

The entry for this kind of replication agreement resides immediately below the node that serves as the supplier. Thus, the DN of the replication agreement as found on a supplier node is:

orclagreementID=unique_identifier_of_the_replication_agreeement, orclReplicaID=unique_identifier_of_supplier_node, cn=replication configuration

Similarly, the DN of the replication agreement as found on a consumer node is:

orclagreementID=unique_identifier_of_the_replication_agreeement, orclReplicaID=unique_identifier_of_supplier_node, cn=replication configuration

In a fan-out replication agreement, you can tell which node the agreement entry is associated with by looking at its parent. For example, look at the following replication agreement entry.

orclagreementID=000002,orclReplicaID=node_A,cn=replication configuration

In this example, you can determine that the replication agreement represented by orclagreementID=000002 is associated with node A. This is because the parent of orclagreementID=000002 is orclReplicaID=node_A.

Note:
The container entry cn=replication configuration is replicated on all nodes, but may not be identical on all nodes.