3. The computer system of claim 2 , the query optimization means being operable for determining the ordered sequence at consecutive time intervals.
3. The computer system of claim 2 , the query optimization means being operable for determining the ordered sequence at consecutive time intervals. 4. The computer system of claim 3 , further comprising load determination means for determining a load parameter of the database, wherein the duration of the time intervals is inversely proportional to the load determined by the load determination means.