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The article explains MySQL 8.0's INSTANT DDL algorithm, its default behavior, limitations such as the 64‑change cap, and provides practical recommendations for always specifying the algorithm, monitoring instant changes via INFORMATION_SCHEMA, and safely rebuilding tables when needed.
This article reviews Tencent Cloud’s self‑developed MySQL kernel TXSQL, detailing its enterprise‑grade features, evolutionary roadmap, overall and cloud‑native TDSQL‑C architecture, columnar engine for OLAP, instant DDL capabilities, high‑availability mechanisms, performance optimizations, and the rigorous development and release process that underpins its stability.
The article explains how MySQL 8.0 introduced the instant algorithm for adding columns, compares it with older copy and inplace‑rebuild methods, shows usage examples, performance test results, and outlines the restrictions and version differences of this fast DDL operation.