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Jun 23, 2023 · Databases

Seamless Sharding Migration: Dual‑Write, Mapping Keys, and Diff Validation

This article explains how to smoothly migrate a legacy single‑database system to a sharded architecture by using dual‑write, mapping‑key routing, custom transaction handling, and offline/real‑time diff checks, while detailing the underlying MyBatis integration and component‑based design.