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Parallel database machine architectures based on exotic hardware have evolved to a parallel database systems running atop a parallel dataflow software architecture based on conventional shared-nothing hardware. These new designs provide speedup and scaleup when processing relational database queries. This paper reviews the techniques used by such systems, and surveys current commercial and research systems. References 20doi:10.1145/122058.122071 fatcat:4mjtunvs2bav5c27z2jjdeu4zy