An ordering index is a type of LDAP Indexes that is used to keep track of the relative order of values for an attribute. It is very similar to an equality index except that it uses an ordering matchingRule instead of an equality matching rule to normalize the values. Ordering indexes may not be maintained for attributes that do not have a corresponding ordering matching rule.

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There might be more information for this subject on one of the following:

• Glossary Of LDAP And Directory Terminology
• LDAP Indexes