Parallel query optimisation in clustered node distributed relational database systems SinclairGreg 2019 This thesis investigates how parallel query optimisation techniques for relational database systems can be utilised on varying parallel architectures. Three architectures are discussed: Symmetrric MultiProcessor (SMP), Clustered Node Processor (CNP) and Massively Parallel Processor (MPP). All exhibit certain parallel properties, but vary according to the specific architecture. Particular attention is devoted to CNP architectures. [...]