graph TD
A[金融业务需求] --> B[强一致性]
A --> C[高可用性]
A --> D[高性能]
B --> E[ACID保障]
C --> F[故障自动恢复]
D --> G[低延迟响应]classDef challenge fill:#f96,stroke:#333;
class B,C,D challenge;
2. 事务隔离级别深度解析
2.1 隔离级别对比测试
-- 测试准备
CREATE TABLE account (id INT PRIMARY KEY,balance DECIMAL(10,2),version INT
) ENGINE=InnoDB;INSERT INTO account VALUES (1, 1000.00, 0), (2, 2000.00, 0);-- 测试1：脏读验证
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
START TRANSACTION;
-- 会话A更新但不提交
UPDATE account SET balance = balance - 100 WHERE id = 1;
-- 会话B可看到未提交数据
SELECT * FROM account WHERE id = 1;-- 测试2：可重复读验证
SET TRANSACTION ISOLATION LEVEL REPEATA
