优化WordPress数据库只需6步，给网站提点速吧！

WordPress的文章、评论等很多数据都是存放在数据库的，所以搭建wordpress网站的时间，网站的空间不需要多大，而数据库一定要充足，而在WordPress数据库中主要使用 wp_posts 表来存储日志，页面，附件，导航菜单等数据，根据使用的时间越来越长，堆积的数据越来越多，从而运行起来也越来越慢，那么我是十分有必要对 WordPress数据库来进行整体的优化下。

优化前后

亲测优化前SQL数据库为5.69M，优化后SQL数据库为2.2M，优化了竞达3倍大小。

优化步骤

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_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_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'

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;
OPTIMIZE TABLE
wp_posts;
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';
DELETE FROM wp_comments WHERE
comment_approved != '1';
DELETE FROM wp_comments WHERE
comment_approved != '1';

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
);
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
);
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
);

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