A method, apparatus and system that in an embodiment detect that a trigger exists, where the trigger indicates a potential need to rebuild a saved query access plan, and determine whether a previous job associated with the trigger created a new access plan that was identical to the saved access plan. A catalyst is preferably used to decompose the methanol into hydrogen and CO. The leg portion is sandwiched between the mattress and the box spring and extends toward a second side of the mattress. Each end node stores segment indices for locating segments cached on end nodes or a core node in the system.