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 事务指的是满足 ACID 特性的一组操作，可以通过 Commit 提交一个事务，也可以使用 Rollback 进行回滚。
 
-<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/f74144be-857a-40cd-8ec7-87626ef4e20b.png" width="450px"> </div><br>
+<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207174600729.png"/> </div><br>
 
 ## ACID
 
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 - 在并发的情况下，多个事务并行执行，事务不仅要满足原子性，还需要满足隔离性，才能满足一致性。
 - 事务满足持久化是为了能应对数据库崩溃的情况。
 
-<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/417bc315-4409-48c6-83e0-59e8d405429e.jpg" width="500px"> </div><br>
+<div align="center"> <img src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/image-20191207173012642.png"/> </div><br>
 
 ## AUTOCOMMIT