Intrusive monitoring systems monitor the performance of data communication
networks by transmitting and receiving test packets on the network being
monitored. Even relatively small periods of monitoring can generate significantly
large amounts of data. Primitive network performance data are details of test
packets that are transmitted and received over the network under test. Network
performance information is then derived by significantly processing the primitive
performance data. This information may need to be correlated with information
regarding the configuration and status of various network elements and the test
This thesis suggests that efficient processing of the collected data may be achieved
by reusing and recycling the derived information in the data warehouses and
information systems. This can be accomplished by pre-processing the primitive
performance data to generate Intermediate Information. In addition to being able to
efficiently fulfil multiple information requirements, different Intermediate
Information elements at finer levels of granularity may be recycled to generate
Intermediate Information elements at coarser levels of granularity. The application
of these concepts in processing packet delay information from the primitive
performance data has been studied.
Different Intermediate Information structures possess different characteristics.
Information systems can exploit these characteristics to efficiently re-cycle
elements of these structures to derive the required information elements.
Information systems can also dynamically select appropriate Intermediate
Information structures on the basis of queries posted to the information system as
well as the number of suitable Intermediate Information elements available to
efficiently answer these queries.
Packet loss and duplication summaries derived for different analysis windows also
provide information regarding the network performance characteristics. Due to
their additive nature, suitable finer granularity packet loss and duplication
summaries can be added to provide coarser granularity packet loss and duplication
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.