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Commit cd78602

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‎notes/数据库系统原理.md

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事务被视为不可分割的最小单元,事务的所有操作要么全部提交成功,要么全部失败回滚。
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回滚可以用日志来实现,日志记录着事务所执行的修改操作,在回滚时反向执行这些修改操作即可。
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回滚可以用回滚日志来实现,回滚日志记录着事务所执行的修改操作,在回滚时反向执行这些修改操作即可。
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### 2. 一致性(Consistency)
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一旦事务提交,则其所做的修改将会永远保存到数据库中。即使系统发生崩溃,事务执行的结果也不能丢失。
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可以通过数据库备份和恢复来实现,在系统发生崩溃时,使用备份的数据库进行数据恢复
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使用重做日志来保证持久性
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