Abstract: A method executes at a computer system to retrieve data from a database. Upon receiving a database query, the computer system translates the query into an intermediate representation, and estimates a compilation time to compile the intermediate representation into machine executable code. The query execution time to retrieve a result set is also estimated. In accordance with a determination that the query execution time and compilation time satisfy an interpretation criterion, the computer system invokes a byte code interpreter to interpret the intermediate representation and retrieve the result set from the database. In accordance with a determination that the query execution and compilation times satisfy one of a plurality of compilation criteria, the computer system compiles the intermediate representation to form machine code and executes the machine code to retrieve the result set from the database. In some cases, the query intermediate representation is optimized prior to compilation.

Abstract: A command communication facility is described. The command communication facility includes a sensor unit for detecting a movement of an operator; a fixing unit for securing the sensor unit to the operator; an evaluation unit for evaluating the detected movement of the operator and for identifying a command based upon the detected movement; and a command communication unit for transmitting a control command to a medical facility that is to be operated based upon the identified command. A command communication system is also described. An operating system is also described. A command communication method is also described.