A global topology (with data centers in different countries) might require restricting replication for security or compliance reasons. For example, legal restrictions might state that specific employee information cannot be copied outside of the U.S.A. Or, a site in Australia might require Australian employee details only.
The fractional replication feature enables only a subset of the attributes that are present in an entry to be replicated. Attribute lists are used to determine which attributes can and cannot be replicated. Fractional replication can only be applied to read-only consumers.
Fractional replication can be used to replicate a subset of the attributes of all entries in a suffix or sub-suffix. Fractional replication can be configured, per agreement, to include attributes in the replication or to exclude attributes from the replication. Usually, fractional replication is configured to exclude attributes. The interdependency between features and attributes make managing a list of included attributes difficult.
Fractional replication can be used for the following purposes:
To filter content for synchronization between intranet and extranet servers
To reduce replication costs when a deployment requires only certain attributes to be available everywhere
Fractional replication is configured with the replication agreement properties repl-fractional-include-attr and repl-fractional-exclude-attr attributes. For information about these properties, see repl-agmt(5dsconf). For information about how to configure fractional replication, see Fractional Replication in Sun Directory Server Enterprise Edition 7.0 Administration Guide.