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HomeDatabaseMysql Tutorial一个项目系统的调优_MySQL

最近公司在用一个类似于BLOG的一个系统来管理项目, PHP+MYSQL架构,同事反应这个系统打开项目的时候非常慢,由于这个系统的服务器在美国,为了查找问题,首先从ftp站点把源文件下载下来,然后用phpmyadmin把mysql数据库的文件备份下来,这样就可以在本地虚拟机搭建起了一个测试环境,

ubuntu10.4+apache2+mysql+php

开始做一些简单配置系统就开始运行,可能跟源系统的具体配置不一样,php运行起来还是有点错误,结果导致apache2的错误日志文件急速增长,最后通过在php语句中添加错误屏蔽语句才解决这个,这样系统总算能运行起来了,

接下来开始优化一些mysql的参数变量,做了些修改以后还是觉得没有明显的改善。

设置慢查询,查询结果如下:

mysqldumpslow mysql-slow.log,发现下面这条语句耗时最多,而且需要重复运行很多遍

sbvgroup@ubuntu104:/var/log/mysql$ mysqldumpslow mysql-slow.log

Reading mysql slow query log from mysql-slow.log
Count: 29  Time=3.68s (106s)  Lock=0.00s (0s)  Rows=646.8 (18757), root[root]@localhost
  SELECT
  prj_id, dep_id
 
  FROM
  sys_projeto,
  sys_grupo,
  sys_grupo_projeto,
  sys_usuario_grupo,
  sys_usuario,
  sys_departamento,
  sys_departamento_projeto,
  sys_usuario_projeto_departamento
 
 
  WHERE
  prj_remove 'S' 
  AND grp_remove 'S'
  AND grpr_remove 'S'
  AND usu_id = '100048'  AND usu_remove 'S'
  AND usug_remove 'S'
  AND dep_remove 'S'
  AND depp_remove 'S'
  AND usupd_remove 'S'
  AND usu_id = usug_idusuario
  AND usug_idgrupo = grp_id
  AND grp_id = grpr_idgrupo
  AND grpr_idprojeto = prj_id
  AND usu_id = usupd_idusuario
  AND prj_id = usupd_idprojeto
  AND prj_id = depp_idprojeto
  AND dep_id = usupd_iddepartamento
  AND dep_id = depp_idderpatamento
  AND usupd_iddepartamento '100048'
 
  UNION 
 
  SELECT
  prj_id, dep_id
  FROM sys_projeto,
  sys_usuario,
  sys_departamento,
  sys_departamento_projeto
 
  WHERE prj_remove 'S'
  AND usu_remove 'S'
  AND dep_remove 'S'
  AND depp_remove 'S'
  AND dep_id = depp_idderpatamento
  AND depp_idprojeto = prj_id
  AND usu_id = '100048' 
  AND prj_idgerente = usu_id

然后针对语句条用的表字段做了些索引,结果得到改善,本人对sql语句不是很精通,可能是这条语句本身的执行效率就不高,再加上没有适当索引,所以导致系统运行很慢。

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