我正在運行的網站,我有兩個非常重複的查詢。而在MySQL中,innoDB進程可以看到他們花費了大量的時間,並且每當我看到那些在那裏的進程時,他們就一直在創建臨時表,並花費很長時間來執行大量內存和CPU。很多MySQL臨時表
他們真的很糟糕,我以某種方式設法優化這些......但我無法做到超越這一點。在模塊
- item_id - user_id - profile_id - uniq
$getmoddetails = "SELECT a.id, a.name, a.defvar, a.description, a.icon, a.thumb, a.average_rating, a.total_rating, c.rating, a.group_access, d.long_name, a.editor_id, e.users_count
FROM dir_cat_item AS b
INNER JOIN dir_item AS a ON a.id = b.item_id
AND a.status = 'O'
LEFT JOIN dir_item_notation_user_map AS c ON a.id = c.item_id
AND c.user_id =%u
LEFT JOIN users AS d ON d.id = a.editor_id
LEFT JOIN (SELECT item_id, COUNT(*) AS users_count
FROM module
GROUP BY item_id) AS e ON e.item_id = b.item_id
WHERE a.id=%u";
$getnbModules_by_col = "SELECT
posx,COUNT(posx) as nb
FROM module WHERE
user_id = %u
AND profile_id = %u
GROUP BY posx
ORDER BY posx ASC";
表的索引,爲用戶表
- id - username
任何建議,請...
更新: -
CREATE TABLE IF NOT EXISTS `module` (
`item_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
`user_id` int(10) unsigned NOT NULL DEFAULT '0',
`profile_id` int(3) unsigned NOT NULL DEFAULT '0',
`posx` tinyint(3) unsigned NOT NULL DEFAULT '0',
`posy` tinyint(3) unsigned NOT NULL DEFAULT '0',
`posj` tinyint(3) unsigned NOT NULL DEFAULT '0',
`x` smallint(5) unsigned NOT NULL DEFAULT '0',
`y` smallint(5) unsigned NOT NULL DEFAULT '0',
`typ` char(1) CHARACTER SET utf8 NOT NULL DEFAULT 'D',
`variables` text COLLATE utf8_unicode_ci,
`uniq` smallint(5) unsigned NOT NULL DEFAULT '1',
`blocked` tinyint(1) unsigned NOT NULL DEFAULT '0',
`minimized` tinyint(1) unsigned NOT NULL DEFAULT '0',
`old_id` tinyint(3) unsigned DEFAULT NULL,
`feed_id` mediumint(8) unsigned NOT NULL DEFAULT '0',
`shared` varchar(33) COLLATE utf8_unicode_ci DEFAULT NULL,
`currentview` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
KEY `item_id` (`item_id`,`user_id`,`profile_id`,`uniq`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
item_id 18 A No
user_id 393467 A No
profile_id 393467 A No
uniq 393467 A No
預先感謝您
'EXPLAIN PLAN'和完整'SHOW CREATE語句TABLE'效果好嗎 – Sebas