Why MySQL Updates Sometimes Disappear: InnoDB Read View Explained

A nighttime incident revealed that a MySQL transaction updated a row but subsequent reads returned the old value, prompting a deep investigation that uncovered InnoDB’s repeatable‑read snapshot behavior, concurrent updates, and how MySQL may skip updates when data appears unchanged, along with reproducible steps and mitigation advice.

DatabaseInnoDBRead View

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Why MySQL Updates Sometimes Disappear: InnoDB Read View Explained

Zhuanzhuan Tech

Aug 29, 2025 · Databases

Why MySQL Returns Old Values After Update: Inside InnoDB Snapshot Reads

This article investigates a puzzling MySQL behavior where a row updated within a transaction sometimes returns its previous value, explains the role of InnoDB's snapshot reads and ReadView, reproduces the issue, and offers practical ways to prevent the “update disappearance” scenario.

InnoDBSnapshot ReadUpdate Anomaly

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Why MySQL Returns Old Values After Update: Inside InnoDB Snapshot Reads