Superindexing

In addition to full text and field based indexing, Logger later creates superindexes for common IP address, host name, and user name fields. Superindexes enable Logger to quickly determine whether a particular field value has been stored on this Logger, and if it has, to narrow down the search to sections of data where that field value exists. Therefore, searches that can take advantage of superindexes return very quickly if there are no hits and return results more quickly than regular searches when there are very few hits.

For information on how to use superindexes, see Searching for Rare Field Values.
A complete list of super-indexed fields is included in Using Super-Indexed Fields to Increase Search Speed.