18.4. Benchmark Queries
In creating the data set above, we make it possible to tease apart data with different characteristics and to issue queries with well-controlled yet vastly differing data access patterns. We are more interested in evaluating the cost of individual pieces of core query functionality than in evaluating the composite performance of application-level queries. Knowing the costs of individual basic operations, we can estimate the cost of any complex query by just adding up relevant piecewise costs (keeping in mind the pipelined nature of evaluation, and the changes in sizes of intermediate results when operators are pipelined).
One clean way to decompose complex queries is by means of algebra. While the benchmark is not tied ...
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