JSON Field

Zhuanzhuan Tech

May 15, 2025 · Databases

Dynamic Extension of Fields in Billion‑Row Tables: Challenges and Practical Solutions

This article examines the difficulties of adding new fields to a core billion‑row MySQL table—including locking, page splitting, and index degradation—and presents a configuration‑driven, three‑layer architecture that uses JSON extension fields, extension tables, and Elasticsearch to achieve safe, scalable dynamic schema evolution.