1.4. Enhanced: 20-Way Multi-Master Replication
In previous versions of Red Hat Directory Server, multi-master replication was supported with up to four
masters in a single replication topology. In 9.0, it is possible to have up to 20 masters in a replication
topology.
1.5. Enhancement: Separate Resource Limits for Simple Paged Results
Resource limits set limits on searches, based on things like the number of results returned, the time of
searches, and the number of entries checked. Resource limits can be applied to a user or to the entire
directory.
Beginning in Directory Server 8.2, Directory Server supports simple paged searches, which returns
paged results (chunks of the search results at a time, rather than altogether). Because the performance
is better with paged searches, Directory Server 9.0 introduces new attributes to set different resource
limits for paged searches and standard searches. T his allows administrators to set higher resource
limits for paged searches (improving user experience) while keeping the lower resource limits for regular
searches (maintaining performance).
For more information on resource limits and paged searches, see the 9.0 Administrator's Guide.
1.6. New: Attributes for Samba Interoperability with the Retro Changelog
Two new attributes, isreplicate and nsslapd-attribute, have been added to the Retro Changelog
Plug-in to better integrate Directory Server with other applications, like Samba. T he nsslapd-attribute
attribute explicitly includes Directory Server attributes in the retro changelog entries; this enables
operational attributes (normally excluded from replication) to be included in changelog entries and
available to other servers.
1.7. Enhanced: Added Global Entry USN Count
Beginning in Directory Server 8.2, changes to entries were tracked on the local database using a local
update sequence number. Whenever a change was made anywhere in the database, the counter was
incremented up and the entryusn attribute on the entry was updated.
In Directory Server 9.0, USNs can be maintained not only on the local database, but across all
databases in the directory if the USN Plug-in is set to global mode.
1.8. Enhanced: DNA Plug-in Handles Multiple Attributes in Same Range
The Distributed Numeric Assignment (DNA) Plug-in assigns unique numbers, from within a given range,
automatically to given entries. In 8.2, the DNA Plug-in assigned those numbers to a single attribute type;
starting in 9.0, the DNA Plug-in can assign numbers from the same range to multiple attribute types.
This allows the same number to be assigned to different attributes. For example, the DNA Plug-in can
assign the same value to the uidNumber and gidNumber attributes
1.9. Enhanced: Added Option to Have Separate Fractional Replication List for
Total Updates
Fractional replication allows specific attributes to be excluded from replication updates.
Directory Server 9.0 introduces a new attribute, nsDS5ReplicatedAttributeListTotal, which sets a
second list of attributes to exclude from replication, specifically from a total update. This allows different
attributes to be excluded from a regular, incremental update than a total update. Very large attributes —
like certificates or binary attributes — can be excluded from a regular update, but included in total
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