三角洲手游外挂,MySQL如何避_
事务B反向操作2. 批量操作
:大批量UPDATE未按固定顺序处理记录
3. 间隙锁冲突:范围查询与插入操作产生锁竞争 -- 典型死锁示例 -- 事务1 BEGIN; UPDATE accounts SET balance = balance - 100 WHERE user_id = 1; UPDATE transactions SET status = completed WHERE tx_id = 1001; -- 事务2(并发执行) BEGIN; UPDATE transactions SET status = pending WHERE tx_id = 1001; UPDATE accounts SET balance = balance + 100 WHERE user_id = 1;