The Exact module groups results into three strata based on how well they match the query string:
The highest stratum contains results whose complete text matches the user’s query exactly.
The middle stratum contains results that contain the user’s query as a subphrase.
The lowest stratum contains other hits (such as normal conjunctive matches). Any match that would not be a match without query expansion lands in the lowest stratum. Also in this stratum are records that do not contain relevance ranking terms (such as those specified in the
Nrrquery parameter).
Note
The Exact module is computationally expensive, especially on large text fields. It is intended for use only on small text fields (such as dimension values or small property values like part IDs). This module should not be used with large or offline documents (such as FILE or ENCODED_FILE properties). Use of this module in these cases will result in very poor performance and/or application failures due to request timeouts. The Phrase module, with and without approximation turned on, does similar but less sophisticated ranking that can be used as a higher performance substitute.
