Ketal compounds of the structure Iand a method of preparation of the compound from polyols and oxocarboxylates, as well as uses thereof. More particularly, the method is executed on a microprocessor and reduces database cache misses and improves the processing speed. The transaction data subsystem has multiple data structures for the storage and retrieval of transaction data information, including, an on-us items data structure, a transit items data structure and an all items data structure. Referring to the time interval, the apparatus determines the position to be reached by the jump and begins playback from the position or determines the number of access points to be skipped for the trick play and begins the requested trick play by skipping random access points by the number, thereby providing a user-friendly interface having time-based trick play features.