Architecture Pony

Oct 19, 2026 · Databases

InnoDB Locking Internals: Next-Key Locks, Gap Locks & Real-World Deadlock Cases

This comprehensive guide explains InnoDB's locking mechanisms including record, gap, next-key, and insert intention locks, derives locking rules with concrete examples, walks through UPDATE locking flow and lock0lock.cc source code, and analyzes three real-world deadlock cases with solutions.