Systems or apparatus, methods, data structures andor computer programs are provided for implementing an OLAP system that has increased query execution speed, requires reduced data storage capacity for an OLAP system andor facilitates scaling of an OLAP system to large data cubes. The device is comprised of a base and a telescoping support which can be raised while in use, or lowered while not in use. , by providing links to the external web service. The second support member is fixedly mounted upon the housing, and a second clutch assembly is interposed between the first and second support members. The operational amplifier includes a first-stage amplifying circuit, a second-stage amplifying circuit, and a compensating capacitor coupled to an output end of the first-stage amplifying circuit and having an equivalent capacitance variable to adjust a dominant-pole frequency of the open-loop gain of the operational amplifier.