# 目标列不涉及读写的场景（A）


+ 无 ADD INDEX 操作时:
+ 有 ADD INDEX 操作，且 tidb_ddl_reorg_batch_size = 32 时:

![left](./student-guide/diagram/19-Not-involving-reading-and-writing-01-01.png)

![left](./student-guide/diagram/19-Not-involving-reading-and-writing-01-02.png)

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目标列不涉及读写的场景
350.31
6806