Aikesheng Open Source Community
May 13, 2019 · Databases
Understanding Cardinality and HINT Usage in MySQL Query Optimization
This article explains the concepts of cardinality and HINT in MySQL, demonstrates how inaccurate cardinality can lead to sub‑optimal execution plans, and shows how applying index_merge hints dramatically reduces query cost and row scans for multi‑column predicates.
CardinalityIndex HintQuery Optimizer
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