一个项目系统的调优_MySQL

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。