2. The Directory Server Access Control Model
3. Understanding the Directory Server Schema
4. Directory Server Index Databases
5. Understanding Directory Server Plug-Ins
6. Directory Server Replication
An ordering index is a type of index that is used to keep track of the relative order of values for an attribute. It is similar to an equality index except that it uses an ordering matching rule instead of an equality matching rule to normalized value the values. Ordering indexes may not be maintained for attributes that do not have a corresponding ordering matching rule.