DeWu Technology
Jan 19, 2026 · Big Data
How to Speed Up Full‑Scale Data Comparison for Massive Migration Projects
This article details the challenges of comparing billions of rows during large‑scale data migrations, presents a multi‑step solution using union‑all grouping, hash‑based aggregation, and intelligent primary‑key detection, and explains platform features, performance optimizations, and future enhancements that reduced comparison time by up to 70%.
data comparisonhash aggregationprimary key detection
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