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如何检查SQL语句中是否有未被索引覆盖的列

存储过程dbms_imci.check_columnar_index()可以解析输入的SQL语句，并得到SQL语句中使用的所有列，并检查这些列是否被列索引覆盖。dbms_imci.check_columnar_index()如果SQL语句中使用了未被列索引覆盖的列，调用该存储过程后会返回这些列所在的...

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如何通过SQL查询查询多元索引嵌套类型的数据

多元索引除了提供Long、Double、Boolean、Keyword、Text等基本类型外，还提供了嵌套类型（Nested）。嵌套类型代表嵌套文档类型。嵌套文档是指对于一行数据（文档）可以包含多个子行（子文档），多个子行保存在一个嵌套类型字段中。本文介绍如何通过SQL查询功能查询嵌套类型的列数据。

问答 2021-10-13 来自：开发者社区

SQL 中经常会用到索引，有时遇到索引失效的情况，是如何导致的？

SQL 中经常会用到索引，有时遇到索引失效的情况，什么情况下会导致索引失效，受何影响的？

问答 2021-10-08 来自：开发者社区

sql语句中如何快速识别并定位哪些书写不规范会导致索引失效

通常在开发过程中编写sql，有时会因不注意导致所写的sql执行过程中索引失效，从而大大减慢了查询语句的效率。所以有什么好的方法能够快速定位sql语句中存在的问题成为初中高级开发人员过程中的一大困惑！

文章 2019-03-06 来自：开发者社区

SQL优化 MySQL版 - 避免索引失效原则（一）

SQL优化 MySQL版 - 避免索引失效原则（一）避免索引失效原则（一）精力有限，剩余的失效原则将会在《避免索引失效原则（二）》中连载出来，请谅解作者： Stanley 罗昊【转载请注明出处和署名，谢谢！】避免索引失效的一些原则我们编写SQL语句后会进行添加一些索引进行优化，但是有时候确实建了索引，但索引有时候会失效；比如在模糊查询使用 in 关键字的时候索引就失效了，这只.....

问答 2016-06-29 来自：开发者社区

SQL语句里使用OR关键字会使索引失效吗

看到OSChina上的两篇文章《OSChina 用户动态设计说明》和《OSChina 的留言表设计说明》中都提到，如果在SQL语句的查询条件中使用OR的话，会消除SQL优化的效果，索引在这里也会失去作用。不明觉厉，求高手指点。

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