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In the InnoDB storage engine, transaction concurrency is managed through two primary mechanisms: Multi-Version Concurrency Control (MVCC) and locking strategies. MVCC maintains version chains to serve snapshot reads, effectively handling dirty reads, non-repeatable reads, and phantom reads for standard queries without explicit locking. However, ...

Database locks serve as a critical mechanism for coordinating concurrent access to shared resources. Beyond traditional resource contention involving CPU, memory, and disk I/O, data itself represents a shared resource accessible to multiple users simultaneously. Ensuring consistency and validity during concurrent data access is a fundamental ch ...