Abstract
This paper introduces the concept of Semi-static Operator Graphs (SOG) to provide a runtime reconfigurable accelerator for query execution based on a Field Programmable Gate Array (FPGA). Instead of generating an FPGA configuration for a given arbitrary query during system runtime, we deploy a general query structure on the FPGA consisting of multiple small reconfigurable partitions (RP). During deployment of the hybrid database system, for each RP various query operators are prepared as reconfigurable modules (RM). At system runtime, the proposed approach dynamically chooses and reconfigures RMs into the RPs regarding a given query. As a result the reconfiguration overhead during system runtime is significantly reduced and enables the utilization of our hybrid architecture in real-world scenarios.
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