http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html

MySQL 5.7 Reference Manual  /  ...  /  Comparison of B-Tree and Hash Indexes

9.3.8 Comparison of B-Tree and Hash Indexes

Understanding the B-tree and hash data structures can help predict how different queries perform on different storage engines that use these data structures in their indexes, particularly for the MEMORY storage engine that lets you choose B-tree or hash indexes.

The index also can be used for LIKE comparisons if the argument to LIKE is a constant string that does not start with a wildcard character.的更多相关文章

  1. Comparison of B-Tree and Hash Indexes

    Understanding the B-tree and hash data structures can help predict how different queries perform on ...

  2. Database | SQL

    Basic of MySQL 创建数据库: mysql> create database xxj; Query OK, row affected (0.00 sec) 列举数据库: mysql& ...

  3. Mysql Hash索引和B-Tree索引区别(Comparison of B-Tree and Hash Indexes)

    上篇文章中说道,Mysql中的Btree索引和Hash索引的区别,没做展开描述,今天有空,上Mysql官方文档找到了相关答案,看完之后,针对两者的区别做如下总结: 引用维基百科上的描述,来解释一下这两 ...

  4. MySQL Range Optimization

    8.2.1.3 Range Optimization MYSQL的Range Optimization的目的还是尽可能的使用索引 The range access method uses a sing ...

  5. A Simple C++ Template Class that Matches a String to a Wildcard Pattern

    A recently implemented enhanced wildcard string matcher, features of which including, Supporting wil ...

  6. Java ArrayList add(int index, E element) example

    Simple add() method is used for adding an element at the end of the list however there is another va ...

  7. Elasticsearch之索引模板index template与索引别名index alias

    为什么需要索引模板? 在实际工作中针对一批大量数据存储的时候需要使用多个索引库,如果手工指定每个索引库的配置信息(settings和mappings)的话就很麻烦了. 所以,这个时候,就存在创建索引模 ...

  8. [Swift]LeetCode880. 索引处的解码字符串 | Decoded String at Index

    An encoded string S is given.  To find and write the decodedstring to a tape, the encoded string is ...

  9. mysql如何使用索引index提升查询效率?

    https://dev.mysql.com/doc/refman/8.0/en/mysql-indexes.html Indexes are used to find rows with specif ...

随机推荐

  1. 使用frameset时的target属性

    http://blog.sina.com.cn/s/blog_8f82e8280101bwx9.html

  2. sed 字符串替换

    1. sed替换的基本语法为: sed 's/原字符串/替换字符串/' 单引号里面,s表示替换,三根斜线中间是替换的样式,特殊字符需要使用反斜线”\”进行转义. 2. 单引号” ‘ ’”是没有办法用反 ...

  3. Spring MVC Test -Controller

    http://www.petrikainulainen.net/programming/spring-framework/unit-testing-of-spring-mvc-controllers- ...

  4. EF框架step by step(1)—Database-First

    ADO.NET Entity Framework 是微软以 ADO.NET 为基础所发展出来的对象关系对应 (O/R Mapping) 解决方案,现已经包含在 Visual Studio 2008 S ...

  5. angularjs指令(二)

    最近学习了下angularjs指令的相关知识,也参考了前人的一些文章,在此总结下. 欢迎批评指出错误的地方.   Angularjs指令定义的API AngularJs的指令定义大致如下 angula ...

  6. unity 解析tmx 2

    using UnityEngine; using System.Collections; using System.Collections.Generic; using System.IO; usin ...

  7. js身份证验证-超级准!!!

    function checkIdcard(idcard) { var Errors = new Array( "验证通过!", "身份证号码位数不对!", &q ...

  8. 【JAVA】Quartz 任务调度和异步执行器

    Quartz基础结构         Quartz对任务调度的领域问题进行了高度抽象,提出了调度器(Scheduler).任务(Job)和触发器(Trigger)这3个核心概念,并在Trigger触发 ...

  9. Maven_非法字符: '\ufeff' 解决方案

    Idea在maven打包时报非法字符: '\ufeff' ,但打开报错的类看没有问题,后来发现是隐蔽字符BOM的问题,解决办法是用Notepad++打开这个类,然后改变编码格式为UTF-8  无DOM ...

  10. Sping Environment为Null的原因和解决方法

    参考:https://github.com/spring-projects/spring-boot/issues/4711 这个issue提出不到20天给我搜出来了,还是相信google的强大 问题: ...