基于MYSQL中优化的一些方法_MySQL
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mysql的存储引擎myisam和innodb以及memory
memory以后会介绍到
innodb支持事物，外键以及行锁，mysql不支持
innodb不支持fulltext索引的类型
innodb不保存具体行数
innodb的auto_increment不支持联合索引
innodb删除表的时候是一行行删除
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大型网站对于数据库的操作优化
1.读写分离，采用主/辅的方式，来分散数据的压力，提高查询速度
2.按照业务特点横向或者纵向分割数据库。简单的来向就是大库变小库，大表变小表，来提高数据库的访问效率。一般来讲，一个数据库具有很多表或一张表有N多的记录，都会明显降低数据库的服务能力，比如mysql数据表记录达到2000W条左右，性能会降到几乎无法忍受。
数据库出现的下一瓶颈
1.事物操作：事物中设计的数据表在运行的过程中将会加锁。在这种情况下，访问这些表的数据会出现延迟
2.数据更新：数据库任何的表在数据更新的过程中，同样会被加锁，则同样会出现延迟
memcache就不会出现以上的情况。
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