Tencent Database Technology

Jan 19, 2023 · Databases

Atomic DDL Implementation in MySQL 8.0: Metadata Management and DDL Log Mechanisms

This article provides a comprehensive technical analysis of MySQL 8.0's atomic DDL implementation, detailing the transition from fragmented FRM-based metadata to a unified InnoDB Data Dictionary, and explaining how the DDL Log mechanism ensures crash-safe physical file operations during schema modifications.