逻辑日志缓冲区是用来存储最后一次备份开始的逻辑日志记录的。

Logical-log buffer is used to store logical log records since last backup.

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可以创建存储库工作区的快照，以提供工作区在该时刻的状况的永久记录。

You can take a snapshot of your repository workspace, to give you a permanent record of what it looked like at the time.

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totalLoength 记录当前存储在缓冲区中的字节数。

The totalLoength records the number of bytes currently stored in the buffer.

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