Abstract: A method for network performance and server application performance monitoring in at least one of the probes in a system having one or more distributed probes and one or more analyzers coupled to a network is disclosed. Configuration information is installed into one or more of the probes. The arrival at the probe of a flow instance of interest is detected based on the configuration information. The probe determines whether arriving flow instance is a new flow instance. If the arriving flow instance is a new flow instance, a state associated with the flow instance is established with the probe. The probe captures relevant information associated with the flow instance and it is determined whether an end of the flow has been reached. Flow monitoring continues until the end of the flow has been reached.

Abstract: A method of controlling the operation of a computer database system. The method of the invention is particularly adapted for use in processing a query in a computer system which has an inference engine, query processing means, and a set of object theories and metatheories. The method includes providing a system theory to define coupling relationships between the object theories and metatheories, selecting an object theory and associated metatheories according to the system theory in dependence on parameters of a query to be processed, and processing the query by the theories so chosen. The coupling relationship may be an interpreter, an assimilator or an attribute metatheory.