Today, in a competitive world, enterprises of all kinds use and depend on timely available, up-to-date information. Information volumes are growing 25-35% per year and the traditional transaction rate has been forecast to grow by a factor of 10 over the next five years-twice the current trend in mainframe growth. In addition, there is already an increasing number of transactions arising from computer systems in business-to-business interworking and by intelligent terminals in the home, office or factory.
The profile of the transaction load is also changing as decision-support queries, typically complex, are added to the existing simpler, largely clerical workloads. Thus, complex queries such as those macro-generated by decision support systems or system-generated as in production control will increase to demand significant throughput with acceptable response times. In addition, very complex queries onvery large databases, generated by skilled staff workers or expert systems, may hurt throughput while demanding good response times