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Update MySQL_InnoDB_engine.md #72

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4 changes: 2 additions & 2 deletions docs/studynotes/database/MySQL/MySQL_InnoDB_engine.md
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Expand Up @@ -285,7 +285,7 @@ show engine innodb status;

![image](https://cdn.jsdelivr.net/gh/xustudyxu/image-hosting1@master/20221002/image.sgj8ivm9ilc.webp)

而对于这四大特性，实际上分为两个部分。 其中的原子性、一致性、持久化，实际上是由InnoDB中的两份日志来保证的，一份是redo log日志，一份是undo log日志。 而持久性是通过数据库的锁，加上MVCC来保证的。
而对于这四大特性，实际上分为两个部分。 其中的原子性、一致性、持久化，实际上是由InnoDB中的两份日志来保证的，一份是redo log日志，一份是undo log日志。 而隔离性是通过数据库的锁，加上MVCC来保证的。

![image](https://cdn.jsdelivr.net/gh/xustudyxu/image-hosting1@master/20221002/image.1oe3nog6lskg.webp)

Expand Down Expand Up @@ -743,4 +743,4 @@ RR隔离级别下，仅在事务中第一次执行快照读时生成ReadView，

所以呢，MVCC的实现原理就是通过 InnoDB表的隐藏字段、UndoLog 版本链、ReadView来实现的。而MVCC + 锁，则实现了事务的隔离性。 而一致性则是由redolog 与 undolog保证。

![image](https://cdn.jsdelivr.net/gh/xustudyxu/image-hosting1@master/20221003/image.28l27i8tw340.webp)
![image](https://cdn.jsdelivr.net/gh/xustudyxu/image-hosting1@master/20221003/image.28l27i8tw340.webp)