Optimistic Locking

Optimistic locking in Redis is implemented using the WATCH command in combination with transactions (MULTI and EXEC). WATCH monitors specified keys for changes before starting a transaction. If any of the watched keys are modified by another client before EXEC is called, the transaction is aborted, and EXEC returns nil instead of executing the queued commands. This allows Redis to handle concurrent updates without requiring traditional locks, making it ideal for scenarios where multiple clients might modify the same keys. Optimistic locking helps maintain data integrity while minimizing the performance overhead typically associated with locking mechanisms.