MySQL高阶教程索引

男娘i 2022-12-26 02:27 33阅读 0赞

> **导语：本教程是笔者用mysql做了一年多简单的开发后，对MySQL有了一定的理解，为了夯实自己的MySQL数据库基础，对MySQL进行了二次学习，期间记下了很多笔记，本教程即是以这些笔记为大纲，内容详尽，理论和实战相结合。如果觉得自己对MySQL的了解不够深入，可以阅读文中的知识概念，并亲手敲一遍文中的实例代码，走完整个教程之后，一定会让自己对MySQL有更加深刻的理解！**

**本篇文章为整个教程的索引部分，可以在这里看到所有文章的层次关系，或者下载文章中使用的数据库SQL文件。**

**目录**

[一、MySQL架构介绍][MySQL]

[二、索引优化分析][Link 1]

[1、性能下降SQL慢][Link 1]

[2、常见通用的Join查询][2_Join]

[3、索引简介][3]

[1.索引是什么][3]

[2.建立索引的优劣势][2.]

[3.MySQL索引的分类][3.MySQL]

[4.MySQL索引的结构][4.MySQL]

[5.哪些情况下需要/不需要建立索引][5.]

[4、性能分析][4]

[1.MySQL Query Optimizer][4]

[2.MySQL常见瓶颈][2.MySQL]

[3.MySQL查询分析工具——Explain的使用][3.MySQL_Explain]

[一.Explain是什么？能干嘛？怎么玩？][3.MySQL_Explain]

[二.各字段解释][.]

[1.Explain字段解释——id][.]

[2.Explain字段解释——select\_type][2.Explain_select_type]

[3.Explain字段解释——table][3.Explain_table]

[4.Explain字段解释——type（重点）][4.Explain_type]

[5.Explain字段解释——possible\_keys][5.Explain_possible_keys]

[6.Explain字段解释——Key\_len][6.Explain_Key_len]

[7.Explain字段解释——ref][7.Explain_ref]

[8.Explain字段解释——rows][8.Explain_rows]

[9.Explain字段解释——Extra（重点）][9.Explain_Extra]

[5、索引优化][5]

[1.索引分析][5]

[2.索引失效（重点）][2. 1]

[3.一般性建议][3.]

[三、查询截取分析][Link 2]

[1、优化查询][Link 2]

[1.永远小表驱动大表][Link 2]

[2.order by关键字优化][2.order by]

[2、慢查询日志][2]

[3、批量数据脚本][3 1]

[4、Show Profile][4_Show Profile]

[四、MySQL锁机制][MySQL 1]

[1、表锁][MySQL 1]

[2、行锁][2 1]

[五、主从复制][Link 3]

--------------------

**本教程中共使用到了两个数据库，myemployees数据库和db0629****数据库，两个SQL文件都放在了我的服务器上，点击即可直接下载：**

**[db0629.sql][]**

**[myemployees.sql][]**

[MySQL]: https://blog.csdn.net/IT_TIfarmer/article/details/110914112
[Link 1]: https://blog.csdn.net/IT_TIfarmer/article/details/110914196
[2_Join]: https://blog.csdn.net/IT_TIfarmer/article/details/110914234
[3]: https://blog.csdn.net/IT_TIfarmer/article/details/110914279
[2.]: https://blog.csdn.net/IT_TIfarmer/article/details/110914320
[3.MySQL]: https://blog.csdn.net/IT_TIfarmer/article/details/110914342
[4.MySQL]: https://blog.csdn.net/IT_TIfarmer/article/details/110914348
[5.]: https://blog.csdn.net/IT_TIfarmer/article/details/110914366
[4]: https://blog.csdn.net/IT_TIfarmer/article/details/110914386
[2.MySQL]: https://blog.csdn.net/IT_TIfarmer/article/details/111192168
[3.MySQL_Explain]: https://blog.csdn.net/IT_TIfarmer/article/details/111192250
[.]: https://mp.csdn.net/editor/html/110521071
[2.Explain_select_type]: https://blog.csdn.net/IT_TIfarmer/article/details/111192589
[3.Explain_table]: https://blog.csdn.net/IT_TIfarmer/article/details/111192732
[4.Explain_type]: https://blog.csdn.net/IT_TIfarmer/article/details/111192820
[5.Explain_possible_keys]: https://blog.csdn.net/IT_TIfarmer/article/details/111193036
[6.Explain_Key_len]: https://blog.csdn.net/IT_TIfarmer/article/details/111193119
[7.Explain_ref]: https://blog.csdn.net/IT_TIfarmer/article/details/111193155
[8.Explain_rows]: https://blog.csdn.net/IT_TIfarmer/article/details/111193205
[9.Explain_Extra]: https://blog.csdn.net/IT_TIfarmer/article/details/111566731
[5]: https://blog.csdn.net/IT_TIfarmer/article/details/116206977
[2. 1]: https://blog.csdn.net/IT_TIfarmer/article/details/116207120
[3.]: https://blog.csdn.net/IT_TIfarmer/article/details/116208170
[Link 2]: https://blog.csdn.net/IT_TIfarmer/article/details/116208296
[2.order by]: https://blog.csdn.net/IT_TIfarmer/article/details/116208662
[2]: https://blog.csdn.net/IT_TIfarmer/article/details/116208827
[3 1]: https://blog.csdn.net/IT_TIfarmer/article/details/116208988
[4_Show Profile]: https://blog.csdn.net/IT_TIfarmer/article/details/116209012
[MySQL 1]: https://blog.csdn.net/IT_TIfarmer/article/details/116209035
[2 1]: https://blog.csdn.net/IT_TIfarmer/article/details/116209074
[Link 3]: https://blog.csdn.net/IT_TIfarmer/article/details/116209121
[db0629.sql]: https://xiaohang456.top/SRepair/db0629.sql
[myemployees.sql]: https://xiaohang456.top/SRepair/myemployees.sql