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MySQL一致性视图问题

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MySQL一致性视图问题

InnoDB为每个事务构造了一个数组，用来保存这个事务启动瞬间，当前正在“活跃”的所有事务ID.
数组里面事务ID的最小值记为低水位，当前系统里面已经创建过的事务ID的最大值加1记为高水位
image.png

一个数据版本的row trx_id,如果落在了黄色部分，为什么说会有两种情况呢？它不应该都是那种活跃的事务？为啥还会有已经提交了的事务生成的，已提交的事务，不应该在绿色部分吗？


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