MySQL的事务隔离级别对数据库性能有直接影响，通常遵循“隔离越强，性能成本越高”的规律🧠。

读未提交(Read Uncommitted) 性能最佳🚀，因为它允许脏读，几乎无锁开销。但数据可靠性低，极少使用。

读已提交(Read Committed) 在性能与一致性间平衡⚖️，通过行锁减少阻塞，适合多数场景。

可重复读(Repeatable Read, MySQL默认) 通过快照隔离保证一致性📸，但会增加内存与CPU开销以维护版本链。

串行化(Serializable) 强制事务串行执行，完全避免并发问题但性能损耗最大🐢，高并发时可能急剧下降。

选择时需权衡业务需求：强一致场景接受性能损耗，高并发追求吞吐则可适当降低隔离级别💡。正确配置能为应用带来最佳平衡！✅

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