Jun 3, 2026 · Databases

Why Using UUID as a Primary Key Can Hurt MySQL Performance

Using UUID as a primary key in MySQL inflates index size, causes random inserts that trigger frequent index and page splits, slows both insert and query operations, and makes updates costly, but techniques such as ordered UUIDs, binary storage, hybrid auto‑increment keys, and table partitioning can mitigate these issues.

Binary StorageIndex PerformanceMySQL

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Why Using UUID as a Primary Key Can Hurt MySQL Performance

Senior Brother's Insights

Nov 4, 2025 · Databases

Why Using UUIDs as MySQL Primary Keys Can Hurt Performance—and How to Fix It

UUIDs provide globally unique identifiers useful in distributed systems, but using them as MySQL primary keys can degrade insert speed, increase storage, and cause page splits; this article explains UUID versions, their structures, performance impacts, and best‑practice techniques such as binary storage, ordered UUIDs, and alternative ID schemes.

Binary StorageMySQLOrdered UUID

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Why Using UUIDs as MySQL Primary Keys Can Hurt Performance—and How to Fix It