Replication And Database Links; Schema Replication - Red Hat DIRECTORY SERVER 8.1 - DEPLOYMENT Deployment Manual

Chapter 6. Designing the Replication Process

6.4.3. Replication and Database Links

With chaining to distribute directory entries, the server containing the database link references a
remote server that contains the actual data. In this environment, the database link itself cannot
be replicated. However, the database that contains the actual data on the remote server can be
replicated.
Do not use the replication process as a backup for database links. Database links must be backed up
manually. For more information about chaining and entry distribution, see
Directory Topology.
Figure 6.10. Replicating Chained Databases

6.4.4. Schema Replication

In all replication scenarios, before replicating data to consumer servers, the supplier server checks
whether its own version of the schema is synchronized with the version of the schema stored on the
consumer servers. The following conditions apply:
• If the schema entries on both supplier and consumers are the same, the replication operation
proceeds.
• If the version of the schema on the supplier server is more recent than the version stored on the
consumer, the supplier server replicates its schema to the consumer before proceeding with the
data replication.
• If the version of the schema on the supplier server is older than the version stored on the consumer,
the server may return many errors during replication because the schema on the consumer cannot
support the new data.
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Chapter 5, Designing the