Generating Estimates For Query Optimization

Abstract

Processes, machines, and stored machine instructions are provided for estimating how many rows would be processed by a query. In one embodiment, model aggregating logic may generate a global model based on separate models for separate portions of a set of data. For example, the separate portions may be assigned to separate partitions of the set of data based at least in part on key values in the separate portions. Generating the global model may include generating an uncompressed model that includes components of the separate models before generating a compressed model to estimate the uncompressed model. Query analysis logic may use the global model to estimate how many rows would be processed by queries that, when executed, would access portion(s) of the set of data.

Dependencies are inferred from the claim text.