如何进行mysql的优化_MySQL
如何进行mysql的优化_MySQL
1,这个比较简单:在phpmyadmin中有提供
2.先设计表的时候考虑选择什么样的存储引擎,myisam不支持事务,但查询速度快,不过现在一般采用的都是InnoDB,能符合95%的项目需求。具体的你可以看看两者的区别。
3.要避免全表查询的操作,这个网上有资料。
4.在where和order by的字段上面建索引,当然索引不是多就好,会使insert和update速度变慢
5,尽量不要采用null值,因为这样搜索引擎会花费大量的时间在这里,而且存储上也有区别,建议采用not null。
6.varchar 和char的选择。可以节省不少空间。
7.字段尽可能短,起的有意义的名字,符合命名规范。
8.避免在where 条件中来使用 <> 或 !=,因为这样会造成全表扫描的。
9,进行分区分表
10.建视图来代替程序中的复杂查询。
11.设置缓存
12.like效率较低,尽量采用不同的sql查询
13. 在where后面的字段中尽量不要采用运算和使用mysql中的函数,例如LOWER()等。
14.between 和in,前者更好
15,写sql语句的时候,思考是否要返回那么多的数据,limit可以进行限制
16,删除表使用truncate不要用delete,因为delete会一行一行的删除。
17.如果一些sql语句都是相同的只是变量不相同,可以进行sql语句合并,采用预处理,可以节省编译的时间。
18.数据库连接池的使用
19,采用集群
20,不用的资源马上释放
21.拆分大的 DELETE 或INSERT 语句,批量提交SQL语句
22.usleep避免服务器宕机
23,select在从服务器上面进行,修改数据的操作在主服务器上
如果还有其他的,后面待补充。
以上就是如何进行mysql的优化_MySQL的内容,更多相关内容请关注PHP中文网(www.php.cn)!

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