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US Patent 10140336 Accuracy testing of query optimizers

Patent 10140336 was granted and assigned to Pivotal Software, Inc. on November, 2018 by the United States Patent and Trademark Office.

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Patent abstract

Query optimizer accuracy is tested by measuring the actual execution times on a database of each of a plurality of alternative query plans for each of a plurality of queries, first ranking the plans by the actual execution times, then ranking the plans by estimated execution times, and correlating the two rankings by computing a rank correlation metric. The rank correlation metric is normalized so that different optimizers can be objectively compared.

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