update basic.rst#5
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| leveldb的写操作并不是直接写入磁盘的，而是首先写入到内存。假设写入到内存的数据还未来得及持久化，leveldb进程发生了异常，抑或是宿主机器发生了宕机，会造成用户的写入发生丢失。因此leveldb在写内存之前会首先将所有的写操作写到日志文件中，也就是log文件。当以下异常情况发生时，均可以通过日志文件进行恢复： | ||
| leveldb的写操作并不是直接写入内存的，而是首先写入到磁盘。假设写入到内存的数据还未来得及持久化，leveldb进程发生了异常，抑或是宿主机器发生了宕机，会造成用户的写入发生丢失。因此leveldb在写内存之前会首先将所有的写操作写到日志文件中，也就是log文件。当以下异常情况发生时，均可以通过日志文件进行恢复： |
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感谢！但是我认为在这里想表达的意思是：
Leveldb的写操作是更新memory db并返回，并不是直接触发一次磁盘写入。
或者我们可以更改为
leveldb在发生写操作时用户数据并不是直接写入磁盘的，而是将其缓存于内存中。
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