我创建了一个带有在 localhost 上运行的查询的存储过程:
在 0,0065s (0,1426s) 内获取 21 行
在服务器上:
在 0,0037 秒 (15,9947 秒) 内提取了 21 行
我尝试了以下选项以在本地主机上获得与服务器相同的结果:
- SQL_NO_CACHE
- 重置缓存
- 刷新缓存
但它并没有给我相同的结果,所以我想知道为什么在服务器上运行的查询要慢得多。
我已经运行了一个解释,但真的不知道我可以从中准备什么:
1, 'PRIMARY', '<derived2>', 'ALL', '', '', '', '', 16106, 100.00, 'Using temporary; Using filesort'
1, 'PRIMARY', 'A', 'ALL', 'PRIMARY', '', '', '', 5214, 100.00, 'Using where; Using join buffer'
2, 'DERIVED', 'T', 'ALL', 'PRIMARY', '', '', '', 76211, 100.00, 'Using wher
e'
这是我正在运行的查询:
SELECT
`A`.`country_description`,
SUM(`turnover_ytd`) AS `turnover_currentyear_ytd`,
SUM(`turnover_ly`) AS `turnover_lastyear_ytd`,
SUM(`turnover_sly`) AS `turnover_2ndlastyear_ytd`,
SUM(`turnover_ytd`) AS `volume_currentyear_ytd`,
SUM(`turnover_ly`) AS `volume_lastyear_ytd`,
SUM(`turnover_sly`) AS `volume_2ndlastyear_ytd`,
COALESCE(((SUM(`turnover_ytd`)-SUM(`turnover_ly`))/SUM(`turnover_ly`))*100, 0) AS `turnover_percentage_currentandlastyear_ytd`,
COALESCE(((SUM(`volume_ytd`)-SUM(`volume_ly`))/SUM(`volume_ly`))*100, 0) AS `volume_percentage_currentandlastyear_ytd`,
COALESCE(((SUM(`turnover_ly`)-SUM(`turnover_sly`))/SUM(`turnover_sly`))*100, 0) AS `turnover_percentage_lastand2ndlastyear_ytd`,
COALESCE(((SUM(`volume_ly`)-SUM(`volume_sly`))/SUM(`volume_sly`))*100, 0) AS `volume_percentage_lastand2ndlastyear_ytd`
FROM
`agent` AS `A`
INNER JOIN
(
SELECT
`debtor_number`,
IF(SUBSTR(`period`,1,4) = SUBSTR(201210,1,4), `turnover_ytd`, 0) AS `turnover_ytd`,
IF(SUBSTR(`period`,1,4) = SUBSTR(201210-100,1,4), `turnover_ytd`, 0) AS `turnover_ly`,
IF(SUBSTR(`period`,1,4) = SUBSTR(201210-200,1,4), `turnover_ytd`, 0) AS `turnover_sly`,
IF(SUBSTR(`period`,1,4) = SUBSTR(201210,1,4), `volume_ytd`, 0) AS `volume_ytd`,
IF(SUBSTR(`period`,1,4) = SUBSTR(201210-100,1,4), `volume_ytd`, 0) AS `volume_ly`,
IF(SUBSTR(`period`,1,4) = SUBSTR(201210-200,1,4), `volume_ytd`, 0) AS `volume_sly`
FROM
`turnover_volume` AS `T`
WHERE
`company_number` = 01
AND
SUBSTR(`period`,5,2) <= SUBSTR(201210,5,2)
AND
SUBSTR(`period`,1,4) IN (SUBSTR(201210,1,4), SUBSTR(201210-100,1,4), SUBSTR(201210-200,1,4))
AND
`turnover_ytd` != 0
AND
`volume_ytd` != 0
) AS `T` ON (`T`.`debtor_number` = `A`.`debtor_number`)
WHERE
`A`.`agent_number` = 003
GROUP BY
`A`.`country_description`;
服务器规格如下:
主机是运行 ESX 的物理服务器,而 Web 服务器在 ESX 内以虚拟方式运行。
主机规格为:
品牌和类型:Altos R720 CPU:Xeon E5404 (2ghz) 存储:通过 Iscsi 通过存储连接。(Eternus DX80) 内存:6 GB
访客规格为: CPU:2x vCPU 内存:2 GB
操作系统是:红帽 4.1.2-44
除了这些规格之外,客人还可以无限制地访问主机。
我的本地 PC 规格是:
CPU:Intel Core 2 Quad CPU Q9300 @ 2.50GHz 内存:3 GB 操作系统:Windows 7 32 位
帮助将不胜感激。