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Dec 4, 2024 · Databases

Understanding InnoDB Undo Log Architecture: Pages, Segments, Rollback Segments, and Undo Tablespaces

This article explains the four‑layer logical structure of InnoDB Undo logs—Undo pages, Undo segments, rollback segments, and Undo tablespaces—detailing their roles, management, related system variables, and how they affect transaction rollback and storage in MySQL 8.0.32.