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Update 事务隔离级别(图文详解).md
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docs/database/事务隔离级别(图文详解).md

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### 事物的特性(ACID)
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<div align="center">
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<img src="https://user-gold-cdn.xitu.io/2018/5/20/1637b08b98619455?w=312&h=305&f=png&s=22430" width="200px"/>
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</div>
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![事物的特性](https://my-blog-to-use.oss-cn-beijing.aliyuncs.com/2019-6/事务特性.png)
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1. **原子性:** 事务是最小的执行单位,不允许分割。事务的原子性确保动作要么全部完成,要么完全不起作用;
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2. **一致性:** 执行事务前后,数据保持一致,多个事务对同一个数据读取的结果是相同的;

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