26. The system of claim 25, wherein: the method further includes establishing predefined expiration criteria for dataset entries represented in the dataset access log and removing dataset entries meeting the expiration criteria from the log; and the predetermined event triggers include removal of a dataset entry from the log and access of a cached dataset.
27. The system of claim 26, the predefined expiration criteria comprising presence of a dataset entry in the dataset access log for a predetermined time without that dataset being accessed.