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We consider the problem of how to best parallelize range
queries in a massive scale distributed database. In tradi-
tional systems the focus has been on maximizing paral-
lelism, for example by laying out data to achieve the highest
throughput. However, in a massive scale database such as
our PNUTS system [11] or BigTable [10], maximizing par-
allelism is not necessarily the best strategy: the system has
more than enough servers to saturate a single client by re-
turning results faster than the client can consume them, and
when there are multiple concurrent queries, maximizing par-