METHOD, APPARATUS, AND COMPUTER PROGRAM PRODUCT FOR ADAPTIVE QUERY PARALLELISM PARTITIONING WITH LOOK-AHEAD PROBING AND FEEDBACK

摘要

A database query is partitioned into an initial partition including a plurality of parallel groups, and is executed, via an execution plan, based on the initial partition. A sampling subset of data is identified from the plurality of parallel groups. Substantially in parallel with the executing of the query, the execution plan is executed on the sampling subset of data as a sampling thread. The execution plan is modified based on feedback from the execution of the execution plan on the sampling subset of data.