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否则 -> 或者 #60

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Jan 2, 2020
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否则 -> 或者 #60

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2 changes: 1 addition & 1 deletion ch3.md
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Expand Up @@ -126,7 +126,7 @@ $ cat database

***并发控制***

由于写操作是以严格顺序的顺序附加到日志中的，所以常见的实现选择是只有一个写入器线程。数据文件段是附加的，否则是不可变的，所以它们可以被多个线程同时读取。
由于写操作是以严格顺序的顺序附加到日志中的，所以常见的实现选择是只有一个写入器线程。数据文件段是附加的，或者是不可变的，所以它们可以被多个线程同时读取。

乍一看，只有追加日志看起来很浪费：为什么不更新文件，用新值覆盖旧值？但是只能追加设计的原因有几个：

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