May 6, 2021 · Databases

How Parallel Query Engines Accelerate Cloud Databases with Cost‑Based Optimization

This article explains how cloud databases use cost‑based parallel query engines to overcome I/O bottlenecks, select tables for parallel scans, implement parallel joins and aggregations, and achieve linear speedups on TPCH benchmarks, highlighting the key techniques and architectural components.

Cost-Based OptimizerParallel ExecutionParallel Query

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How Parallel Query Engines Accelerate Cloud Databases with Cost‑Based Optimization