Abstract: A catch-up mode that runs a virtual programmable interrupt timer faster than a nominal rate to prevent time loss in a virtual machine can be implemented. If time loss is determined, a catch-up mode can be initiated to cause increased firings, beyond a nominal rate, of the programmable interrupt timer to adjust the clock of the virtual machine to the clock of the host system. The virtual programmable interrupt timer can also be readjusted to a predetermined nominal rate when the time loss in the guest operating system is determined approximately within a predetermined tolerance range. The catch-up mode can be monitored to avoid “interrupt storms” on the virtual machine. The virtual programmable interrupt timer can be altered by the guest operating system to accommodate different operating systems.

Abstract: A method of accumulating and aggregating statistics concerning the use of database table indexes includes using a plurality of counters to register index use. The plurality of counters allow multiple instances of index usage to be recorded simultaneously. A missing index may be detected using an optimal index in a query plan. The optimal index is compared against the available indexes to determine if an index is missing. Statistics may be gathered against the used and missing indexes.

Abstract: Methods, systems, and computer storage media having computer-executable instructions embodied thereon that, when executed, perform methods in accordance with embodiments hereof, for emulating execution of divergent program execution paths to determine whether any “would be” program defects exist in a particular divergent program execution path and/or to determine the nature of such “would be” program defects are provided. The dynamic execution state (e.g., register values and memory locations) of a program being executed is cloned at a point of potential divergence and a virtual processor having the same dynamic execution state is generated. Subsequently, utilizing the virtual processor, a test trace is initiated along the divergent program execution path and information gathered during the test trace is analyzed to identify any program defects that may have occurred had the program execution followed the divergent path.