Title Parallel Aggregation for Temporal Databases

Any software made available via TimeCenter is provided \as is " and without any express or implied warranties, including, without limitation, the implied warranty of merchantability and tness for a particular purpose. The TimeCenter icon on the cover combines two \arrows. " These \arrows " are letters in the so-called Rune alphabet used one millennium ago by the Vikings, as well as by their precedessors and successors. The Rune alphabet (second phase) has 16 letters, all of which have angular shapes and lack horizontal lines because the primary storage medium was wood. Runes may also be found on jewelry, tools, and weapons and were perceived by many ashaving magic, hidden powers. The two Rune arrows in the icon denote \T " and \C, " respectively. The ability to model the temporal dimension is essential to many applications. Furthermore, the rate of increase in database size and stringency of response time requirements has out-paced advancement