Methods for distributed join processing using a voice-data protocol

The authors consider the problem of optimizing join query processing in a database distributed over a bus type local area network which uses the carrier sense multiple access/collision detection (CSMA/CD) access protocol. Some new algorithms are proposed which use a compatible access protocol, movable slot time division multiplexing (MSTDM), to achieve improved performance over existing algorithms. Analysis of example cases shows the improved performance potential for MSTDM. It is concluded that the proposed algorithms explicitly account for packetization and other costs unaccounted for in existing algorithms. If the overhead of CSMA/CD and MSTDM algorithms is comparable, MSTDM´s performance characteristics translate directly into improved distributed join processing