更好的控制手工索引和索引编写（RAM使用、非混合的文件格式标志等等）。

Better control over manual indexing and index writing (RAM consumption, non-compound file format flag etc).

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重新生成索引的速度更快(让未改变的部分保持打开)并且读取索引时的并发性更好(使用了只读标志)。

Faster index reopening (keeps unchanged segments opened) and better index reader concurrency (use of the read only flag).

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为了快速，简便的安装一个插槽是在空心轴编码器，当它们对齐掩护模压标志规定，设置索引。

For fast, easy installation a slot is provided on the encoder hollow shaft, which when aligned to molded mark on cover, sets the index.

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