得到WordPress的MySQL查詢

的WordPress的實例擺脫文件排序的我管理的下降大約每天一次由於這個怪物的MySQL查詢到的時間太長了：得到WordPress的MySQL查詢

SELECT SQL_CALC_FOUND_ROWS distinct wp_posts.* 
FROM wp_posts 
LEFT JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) LEFT JOIN wp_term_taxonomy ON wp_term_taxonomy.term_taxonomy_id = wp_term_relationships.term_taxonomy_id LEFT JOIN wp_ec3_schedule ec3_sch ON ec3_sch.post_id=id 
WHERE 1=1 AND wp_posts.ID NOT IN (SELECT tr.object_id 
FROM wp_term_relationships AS tr INNER JOIN wp_term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id 
WHERE tt.taxonomy = 'category' AND tt.term_id IN ('1050')) AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish') AND NOT EXISTS (SELECT * 
FROM wp_term_relationships JOIN wp_term_taxonomy ON wp_term_taxonomy.term_taxonomy_id = wp_term_relationships.term_taxonomy_id 
WHERE wp_term_relationships.object_id = wp_posts.ID AND wp_term_taxonomy.taxonomy = 'category' AND wp_term_taxonomy.term_id IN (533,3567)) AND ec3_sch.post_id IS NULL GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 10;

我有什麼做的就是擺脫非常緩慢的文件？我認爲多列type_status_date索引足夠快。

EXPLAIN EXTENDED輸出如下。

+----+--------------------+-----------------------+--------+-----------------------------------+------------------+---------+---------------------------------------------------------------------------------+------+----------------------------------------------+ 
| id | select_type  | table     | type | possible_keys      | key    | key_len | ref                    | rows | Extra          | 
+----+--------------------+-----------------------+--------+-----------------------------------+------------------+---------+---------------------------------------------------------------------------------+------+----------------------------------------------+ 
| 1 | PRIMARY   | wp_posts    | ref | type_status_date     | type_status_date | 124  | const,const                  | 7034 | Using where; Using temporary; Using filesort | 
| 1 | PRIMARY   | wp_term_relationships | ref | PRIMARY       | PRIMARY   | 8  | bwog_wordpress_w.wp_posts.ID             | 373 | Using index         | 
| 1 | PRIMARY   | wp_term_taxonomy  | eq_ref | PRIMARY       | PRIMARY   | 8  | bwog_wordpress_w.wp_term_relationships.term_taxonomy_id       | 1 | Using index         | 
| 1 | PRIMARY   | ec3_sch    | ref | post_id_index      | post_id_index | 9  | bwog_wordpress_w.wp_posts.ID             | 1 | Using where; Using index      | 
| 3 | DEPENDENT SUBQUERY | wp_term_taxonomy  | range | PRIMARY,term_id_taxonomy,taxonomy | term_id_taxonomy | 106  | NULL                   | 2 | Using where         | 
| 3 | DEPENDENT SUBQUERY | wp_term_relationships | eq_ref | PRIMARY,term_taxonomy_id   | PRIMARY   | 16  | bwog_wordpress_w.wp_posts.ID,bwog_wordpress_w.wp_term_taxonomy.term_taxonomy_id | 1 | Using index         | 
| 2 | DEPENDENT SUBQUERY | tt     | const | PRIMARY,term_id_taxonomy,taxonomy | term_id_taxonomy | 106  | const,const                  | 1 |            | 
| 2 | DEPENDENT SUBQUERY | tr     | eq_ref | PRIMARY,term_taxonomy_id   | PRIMARY   | 16  | func,const                  | 1 | Using index         | 
+----+--------------------+-----------------------+--------+-----------------------------------+------------------+---------+---------------------------------------------------------------------------------+------+----------------------------------------------+ 
8 rows in set, 2 warnings (0.05 sec)

和CREATE TABLE：

CREATE TABLE `wp_posts` (
    `ID` bigint(20) unsigned NOT NULL auto_increment, 
    `post_author` bigint(20) unsigned NOT NULL default '0', 
    `post_date` datetime NOT NULL default '0000-00-00 00:00:00', 
    `post_date_gmt` datetime NOT NULL default '0000-00-00 00:00:00', 
    `post_content` longtext NOT NULL, 
    `post_title` text NOT NULL, 
    `post_excerpt` text NOT NULL, 
    `post_status` varchar(20) NOT NULL default 'publish', 
    `comment_status` varchar(20) NOT NULL default 'open', 
    `ping_status` varchar(20) NOT NULL default 'open', 
    `post_password` varchar(20) NOT NULL default '', 
    `post_name` varchar(200) NOT NULL default '', 
    `to_ping` text NOT NULL, 
    `pinged` text NOT NULL, 
    `post_modified` datetime NOT NULL default '0000-00-00 00:00:00', 
    `post_modified_gmt` datetime NOT NULL default '0000-00-00 00:00:00', 
    `post_content_filtered` text NOT NULL, 
    `post_parent` bigint(20) unsigned NOT NULL default '0', 
    `guid` varchar(255) NOT NULL default '', 
    `menu_order` int(11) NOT NULL default '0', 
    `post_type` varchar(20) NOT NULL default 'post', 
    `post_mime_type` varchar(100) NOT NULL default '', 
    `comment_count` bigint(20) NOT NULL default '0', 
    `robotsmeta` varchar(64) default NULL, 
    PRIMARY KEY (`ID`), 
    KEY `post_name` (`post_name`), 
    KEY `type_status_date` (`post_type`,`post_status`,`post_date`,`ID`), 
    KEY `post_parent` (`post_parent`), 
    KEY `post_date` (`post_date`), 
    FULLTEXT KEY `post_related` (`post_title`,`post_content`) 
)

警告：

mysql> SHOW warnings \G 
*************************** 1. row *************************** 
Level: Note 
Code: 1276 
Message: Field or reference 'bwog_wordpress_w.wp_posts.ID' of SELECT #3 was resolved in SELECT #1 
*************************** 2. row *************************** 
Level: Note 
Code: 1003 
Message: select distinct sql_calc_found_rows `bwog_wordpress_w`.`wp_posts`.`ID` AS `ID`,`bwog_wordpress_w`.`wp_posts`.`post_author` AS `post_author`,`bwog_wordpress_w`.`wp_posts`.`post_date` AS `post_date`,`bwog_wordpress_w`.`wp_posts`.`post_date_gmt` AS `post_date_gmt`,`bwog_wordpress_w`.`wp_posts`.`post_content` AS `post_content`,`bwog_wordpress_w`.`wp_posts`.`post_title` AS `post_title`,`bwog_wordpress_w`.`wp_posts`.`post_excerpt` AS `post_excerpt`,`bwog_wordpress_w`.`wp_posts`.`post_status` AS `post_status`,`bwog_wordpress_w`.`wp_posts`.`comment_status` AS `comment_status`,`bwog_wordpress_w`.`wp_posts`.`ping_status` AS `ping_status`,`bwog_wordpress_w`.`wp_posts`.`post_password` AS `post_password`,`bwog_wordpress_w`.`wp_posts`.`post_name` AS `post_name`,`bwog_wordpress_w`.`wp_posts`.`to_ping` AS `to_ping`,`bwog_wordpress_w`.`wp_posts`.`pinged` AS `pinged`,`bwog_wordpress_w`.`wp_posts`.`post_modified` AS `post_modified`,`bwog_wordpress_w`.`wp_posts`.`post_modified_gmt` AS `post_modified_gmt`,`bwog_wordpress_w`.`wp_posts`.`post_content_filtered` AS `post_content_filtered`,`bwog_wordpress_w`.`wp_posts`.`post_parent` AS `post_parent`,`bwog_wordpress_w`.`wp_posts`.`guid` AS `guid`,`bwog_wordpress_w`.`wp_posts`.`menu_order` AS `menu_order`,`bwog_wordpress_w`.`wp_posts`.`post_type` AS `post_type`,`bwog_wordpress_w`.`wp_posts`.`post_mime_type` AS `post_mime_type`,`bwog_wordpress_w`.`wp_posts`.`comment_count` AS `comment_count`,`bwog_wordpress_w`.`wp_posts`.`robotsmeta` AS `robotsmeta` from `bwog_wordpress_w`.`wp_posts` left join `bwog_wordpress_w`.`wp_term_relationships` on((`bwog_wordpress_w`.`wp_term_relationships`.`object_id` = `bwog_wordpress_w`.`wp_posts`.`ID`)) left join `bwog_wordpress_w`.`wp_term_taxonomy` on((`bwog_wordpress_w`.`wp_term_taxonomy`.`term_taxonomy_id` = `bwog_wordpress_w`.`wp_term_relationships`.`term_taxonomy_id`)) left join `bwog_wordpress_w`.`wp_ec3_schedule` `ec3_sch` on((`bwog_wordpress_w`.`ec3_sch`.`post_id` = `bwog_wordpress_w`.`wp_posts`.`ID`)) where ((not(<in_optimizer>(`bwog_wordpress_w`.`wp_posts`.`ID`,<exists>(select 1 AS `Not_used` from `bwog_wordpress_w`.`wp_term_relationships` `tr` join `bwog_wordpress_w`.`wp_term_taxonomy` `tt` where ((`bwog_wordpress_w`.`tr`.`term_taxonomy_id` = '3572') and ('category' = _utf8'category') and (<cache>(`bwog_wordpress_w`.`wp_posts`.`ID`) = `bwog_wordpress_w`.`tr`.`object_id`)))))) and (`bwog_wordpress_w`.`wp_posts`.`post_type` = _utf8'post') and (`bwog_wordpress_w`.`wp_posts`.`post_status` = _utf8'publish') and (not(exists(select 1 AS `Not_used` from `bwog_wordpress_w`.`wp_term_relationships` join `bwog_wordpress_w`.`wp_term_taxonomy` where ((`bwog_wordpress_w`.`wp_term_relationships`.`term_taxonomy_id` = `bwog_wordpress_w`.`wp_term_taxonomy`.`term_taxonomy_id`) and (`bwog_wordpress_w`.`wp_term_relationships`.`object_id` = `bwog_wordpress_w`.`wp_posts`.`ID`) and (`bwog_wordpress_w`.`wp_term_taxonomy`.`taxonomy` = _utf8'category') and (`bwog_wordpress_w`.`wp_term_taxonomy`.`term_id` in (533,3567)))))) and isnull(`bwog_wordpress_w`.`ec3_sch`.`post_id`)) group by `bwog_wordpress_w`.`wp_posts`.`ID` order by `bwog_wordpress_w`.`wp_posts`.`post_date` desc limit 10,10

2排在組（0.00秒）

來源

2010-05-08 Hans