Red Hat Directory Server 8.0 Administrator's Guide

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Substring index (sub) is a costly index to maintain, but it allows efficient searching against
substrings within entries. Substring indexes are limited to a minimum of three characters for
each entry.
For example, searches of the form cn=*derson , match the common names containing
strings such as Bill Anderson, Jill Henderson, or Steve Sanderson. Similarly, the search
for telephonenumber= *555* returns all the entries in the directory with telephone numbers
that contain 555.
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International index speeds up searches for information in international directories. The
process for creating an international index is similar to the process for creating regular
indexes, except that it applies a matching rule by associating an object identifier (OID) with
the attributes to be indexed.
The supported locales and their associated OIDs are listed in Appendix D,
Internationalization. If to configure the Directory Server to accept additional matching rules,
contact Red Hat Professional Services.
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Browsing index, or virtual list view (VLV) index, speeds up the display of entries in the
Directory Server Console. This index is particularly useful if a branch of your directory
contains hundreds of entries; for example, the ou=people branch. You can create a browsing
index on any branch point in the directory tree to improve display performance through the
Directory Server Console or by using the vlvindex command-line tool, which is explained in
the Directory Server Configuration, Command, and File Reference.
1.2. About Default, System, and Standard Indexes
When you install Directory Server, a set of default and system indexes is created per database
instance. To maintain these indexes, the directory uses standard indexes.
1.2.1. Overview of Default Indexes
The default indexes can be modified depending on the directory indexing needs. Always ensure
that no server plug-ins or other servers depend on a default index before removing it.
Table 10.1, “Default Indexes” lists the default indexes installed with the directory.
Attribute Eq Pres Sub Purpose
cn Improves the
performance of
the most
common types of
user directory
searches.
givenName Improves the
Chapter 10. Managing Indexes
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