MySQL基本概念和常用命令_MySQL
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1 MySQL简介
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Mysql是1985几个瑞典小伙开发的，后来他们成立啦Mysql AB公司，他们当时开发mysql的初衷是为零售商提供数据仓库服务，这也是为什么mysql擅长查询而不是事务处理原因啦，所以他们设计啦一个利用索引顺序存储数据的方法，也就是ISAM存储引擎算法，后来发展为MyISAM存储引擎。mysql具有高性能，高可靠性，易用性等特点，主要适合web网站系统，日志记录系统，数据仓库系统，和嵌入式系统
2.Mysql架构组成
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mysql的物理组成：日志文件，数据文件，Replication相关文件，其他文件
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mysql server的系统架构： SQL Layer和 Storage Engine Layer
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Mysql自带工具介绍mysqladmin命令
#ping 命令查看server是否正常提够服务
mysqladmin -uroot -proot -h localhost ping
#status命令查看当前msyql server的几个状态值
mysqladmin -uroot -proot -h localhost status
#processlist命令获取当前数据库连接线程信息
mysqladmin -uroot -proot -h localhost processlist
3.MySQL 插件式储存引擎介绍
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MyISAM引擎的每一个表都被存放为以表名命名的三个物理文件：tableName.frm,tableName.MYD,tableName.MYI
支持三种索引： B-Tree, R-Tree, Full-text(B-Tree,解决like查询低效问题)
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InnoDB储存引擎特点：支持事务安全，数据多版本读取，外键支持
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