Data Migration Strategies: Dual‑Write and Gray‑Scale Switch Approaches

This article presents two practical database migration schemes—dual‑write and a gray‑scale switch—detailing their workflows, code refactoring, data synchronization using Syncer, consistency verification with sync‑diff‑inspector, and operational trade‑offs for minimizing downtime and ensuring data integrity.

Dual WriteGray SwitchSyncer

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Data Migration Strategies: Dual‑Write and Gray‑Scale Switch Approaches