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fix the default value of sync_binlog
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docs/database/mysql/mysql-logs.md

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- **上图的 write,是指把日志写入到文件系统的 page cache,并没有把数据持久化到磁盘,所以速度比较快**
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- **上图的 fsync,才是将数据持久化到磁盘的操作**
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`write``fsync`的时机,可以由参数`sync_binlog`控制,默认是`0`
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`write``fsync`的时机,可以由参数`sync_binlog`控制,默认是`1`
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`0`的时候,表示每次提交事务都只`write`,由系统自行判断什么时候执行`fsync`
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