WORDPRESS 数据库优化语句

/*optimize */

— 1、温馨提醒优化之前切记先备份下数据
— 2、删除所有日志修订
— — — 影响wordpress运行速度的根源在于日志的修订记录，一百多篇文章会有一千多条的日志修订的记录，所以此步优化必须做，提速效果非常明显。执行以下SQL语句：

— DELETE a,b,c FROM wp_posts a LEFT JOIN
— wp_term_relationships b ON (a.ID = b.object_id) LEFT JOIN wp_postmeta c ON (a.ID
— = c.post_id) WHERE a.post_type = ‘revision’

DELETE a,b,c FROM wp_z8tmn5qbx1_posts a LEFT JOIN
wp_term_relationships b ON (a.ID = b.object_id) LEFT JOIN wp_postmeta c ON (a.ID
= c.post_id) WHERE a.post_type = ‘revision’

SELECT
*
FROM
wp_z8tmn5qbx1_posts p
LEFT JOIN wp_z8tmn5qbx1_term_relationships r ON p.id = r.object_id
LEFT JOIN wp_z8tmn5qbx1_postmeta m ON ( p.id = m.post_id )
WHERE
post_type = ‘revision’

— 3、优化 wp_posts 表 写文章的时候进行的插入、更新或删除等都会产生不同大小的记录碎片，整理碎片这步要做。执行以下SQL语句：
OPTIMIZE TABLE
wp_posts;
— 4、删除所有垃圾留言 这个可以在后台一条一条的删除，也可以到MySQL执行下也行：
DELETE FROM wp_comments WHERE
comment_approved != ‘1’;

— –9148 records
select * from
wp_z8tmn5qbx1_comments

— 5、删除没有的标签 有些文章删除了，但标签还在，WordPress不会自动删除的，我们手动清理下吧， 执行以下SQL语句：
DELETE a,b,c
FROM
wp_terms AS
a
LEFT JOIN wp_term_taxonomy AS c ON a.term_id = c.term_id
LEFT JOIN
wp_term_relationships AS b ON b.term_taxonomy_id = c.term_taxonomy_id
WHERE
(
c.taxonomy = ‘post_tag’ AND
c.count =
0
);
— 11 records
select *
from wp_z8tmn5qbx1_terms t,
wp_z8tmn5qbx1_term_taxonomy tax,
wp_z8tmn5qbx1_term_relationshipstr
WHERE t.term_id =tax.term_id
and tax.term_taxonomy_id=tr.term_taxonomy_id
and (
tax.taxonomy = ‘post_tag’ AND
tax.count =
0
);
— 13
select *
from
wp_z8tmn5qbx1_terms t LEFT JOIN
wp_z8tmn5qbx1_term_taxonomy tax on t.term_id=tax.term_id left join
wp_z8tmn5qbx1_term_relationshipstr on tax.term_taxonomy_id= tr.term_taxonomy_id
where (
tax.taxonomy = ‘post_tag’ AND
tax.count =
0
);

—
— 6、删除没用的 postmeta 记录 当文章的记录删除后，还有日志扩展表postmeta的数据还没有删除，也人工清理下吧，执行以下SQL语句：

DELETE pm FROM wp_postmeta pm LEFT JOIN
wp_posts wp ON wp.ID = pm.post_id WHERE wp.ID IS NULL

— no records
SELECT
*
FROM
wp_z8tmn5qbx1_postmeta m
LEFT JOIN wp_z8tmn5qbx1_posts p ON ( p.id = m.post_id )
WHERE
p.id IS NULL

— 通过以上数据库命令优化，你的数据库是不是已经很小了呢，网站速度是不已经得到提升了呢，记得不要让自己的网站太过臃肿,以免影响访问哦。

评论表垃圾数据

DELETE FROM wp_z8tmn5qbx1_postmeta WHERE meta_key = ‘_edit_lock’;
DELETE FROM wp_z8tmn5qbx1_postmeta WHERE meta_key = ‘_edit_last’;
DELETE FROM wp_z8tmn5qbx1_postmeta WHERE meta_key = ‘_revision-control’;
DELETE FROM wp_z8tmn5qbx1_postmeta WHERE post_id NOT IN (SELECT post_id FROM wp_posts);
DELETE FROM wp_z8tmn5qbx1_postmeta WHERE meta_key = ‘_wp_old_slug’;
DELETE FROM wp_z8tmn5qbx1_postmeta WHERE meta_key = ‘_revision-control’;
DELETE FROM wp_z8tmn5qbx1_postmeta WHERE meta_value = ‘{{unknown}}’;

SELECT *
from wp_z8tmn5qbx1_postmeta WHERE meta_value = ‘ {{ unknown }} ‘;

SELECT *
from wp_z8tmn5qbx1_postmeta WHERE meta_key in (
‘_edit_lock’,
‘_edit_last’,
‘_revision-control’,

)

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