Why MySQL Chooses Full Table Scan Over Index: Uncovering Cost Constant Secrets

This article examines a puzzling MySQL case where the optimizer selects a full‑table scan despite suitable indexes, explains the role of cost constants, execution‑plan analysis, and demonstrates how to force the optimizer to use the optimal index for faster queries.

DatabasesIndex SelectionMySQL

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Why MySQL Chooses Full Table Scan Over Index: Uncovering Cost Constant Secrets