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In analytical applications, database systems often need to sustain workloadswith multiple concurrent scans hitting the same table. The Cooperative Scans(CScans) framework, which introduces an Active Buffer Manager (ABM) componentinto the database architecture, has been the most effective and elaborateresponse to this problem, and was initially developed in the X100 researchprototype. We now report on the the experiences of integrating CooperativeScans into its industrial-strength successor, the Vectorwise database product.During this implementation we invented a simpler optimization of concurrentscan buffer management, called Predictive Buffer Management (PBM). PBM is basedon the observation that in a workload with long-running scans, the buffermanager has quite a bit of information on the workload in the immediate future,such that an approximation of the ideal OPT algorithm becomes feasible. In theevaluation on both synthetic benchmarks as well as a TPC-H throughput run wecompare the benefits of naive buffer management (LRU) versus CScans, PBM andOPT; showing that PBM achieves benefits close to Cooperative Scans, whileincurring much lower architectural impact.

From Cooperative Scans to Predictive Buffer Management