Mike,

>I never said it read the entire CDX file, just the data that represents the index tags involved in the query/filter.

The LOCATE reads the same portion of the index *TAG* as the SEEK command. The difference in performance between the to probably lies in the fact that when a LOCATE command is issued rushmore must determine which indexes to use as opposed to the seek command where the index tag to use is known without intervention of rushmore.

Walter,