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[MySQL] MySQL 中 InnoDB 的普通索引对于 DML 性能影响到底有多大

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  1. 小伙伴们项目中,最多一张表做过多少索引? 5 个? 10 个? 20 个?
  2. InnoDB 的普通索引对于 DML 性能影响到底有多大?假如原插入性能是 5000 TPS ,增加一个索引,至于变成 4500 吗?有没有一种方式可以估算下?
  3. 一张 2000 万行、50 个字段的表,记录的 column01 、column02 、column03 可能会有更新操作,只要我的索引 index01 没有用到 column01 、column02 、column03 ,是不是当 column01 、column02 、column03 变更的时候,就不会有 index01 开销

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