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Monitoring systems today often involve continuous queries over streaming data in a distributed collaborative fashion. The distribution of query operators over a network of processors, as well as their processing sequence, form a query configuration with inherent constraints on the throughput that it can support. In this paper, we discuss the implications of measuring and optimizing for output throughput, as well as its limitations. We propose to use instead the more granular input throughputdoi:10.1109/tkde.2007.1056 fatcat:i7rr3fyu2jhn5labxvhll5k5qq