Question

我有一个我在Wordpress网站上构建的搜索功能，用于搜索名称和地点，如下所示：

#name search
select user_id from wp_usermeta where meta_key='first_name' 
AND meta_value LIKE 'term' 
AND user_id in (SELECT post_author FROM wp_posts WHERE post_type='attachment' 
AND length(post_content) > 0 
AND length(post_title) > 0 
AND post_author in (SELECT post_author FROM wp_posts WHERE post_type='article')) 

UNION 

#locality search
select user_id from wp_usermeta where meta_key in ('zip', 'city', 'state', 'country') 
AND user_id in (select user_id from wp_usermeta where meta_key = 'user_type'and meta_value = 'user') 
AND (meta_value LIKE 'term') 
AND user_id in (SELECT post_author FROM wp_posts WHERE post_type='attachment' 
AND length(post_content) > 0 
AND length(post_title) > 0 
AND post_author in (SELECT post_author FROM wp_posts WHERE post_type='article')) 
group by user_id

这需要大约3秒钟才能运行。我试图看看是否有更快的方式来编写此查询。我有innoDB和索引，但有很多记录。这是我查询的最快版本，但3秒仍然很慢。有什么想法吗？

EDIT（SQL解释结果，倒数第二个值是行数）：

＆＃39; 1＆＃39;，＆＃39; PRIMARY＆＃39;，＆＃39; wp_usermeta＆＃39;，＆＃39; ref＆＃39;，＆＃39; meta_key，FH_DanB_1＆＃39;，＆＃39; FH_DanB_1＆＃39;，＆＃39; 768＆＃39;，＆＃39; const＆＃39;，＆＃39; 98252＆＃39;，＆＃39;使用where＆＃39;

＆＃39; 2＆＃39;，＆＃39;依赖子信息＆＃39; wp_posts＆＃39;，＆＃39; index_subquery＆＃39;，＆＃39; type_status_date，post_author＆＃39; ，＆＃39; post_author＆＃39;，＆＃39; 8＆＃39;，＆＃39; func＆＃39;，＆＃39; 1＆＃39;，＆＃39;使用where＆＃39;

＆＃39; 3＆＃39;，＆＃39;依赖子信息＆＃39; wp_posts＆＃39;，＆＃39; index_subquery＆＃39;，＆＃39; type_status_date，post_author＆＃39; ，＆＃39; post_author＆＃39;，＆＃39; 8＆＃39;，＆＃39; func＆＃39;，＆＃39; 1＆＃39;，＆＃39;使用where＆＃39;

＆＃39; 4＆＃39;，＆＃39; UNION＆＃39;，＆＃39; wp_usermeta＆＃39;，＆＃39; index＆＃39;，＆＃39; meta_key，FH_DanB_1＆＃39;，＆＃39; user_id＆＃39;，＆＃39; 8＆＃39;，NULL，＆＃39; 510714＆＃39;，＆＃39;使用where＆＃39;

＆＃39; 6＆＃39;，＆＃39;相关提示＆＃39;，＆＃39; wp_posts＆＃39;，＆＃39; index_subquery＆＃39;，＆＃39; type_status_date，post_author＆＃39; ，＆＃39; post_author＆＃39;，＆＃39; 8＆＃39;，＆＃39; func＆＃39;，＆＃39; 1＆＃39;，＆＃39;使用where＆＃39;

＆＃39; 7＆＃39;，＆＃39;依赖子信息＆＃39; wp_posts＆＃39;，＆＃39; index_subquery＆＃39;，＆＃39; type_status_date，post_author＆＃39; ，＆＃39; post_author＆＃39;，＆＃39; 8＆＃39;，＆＃39; func＆＃39;，＆＃39; 1＆＃39;，＆＃39;使用where＆＃39;

＆＃39; 5＆＃39;，＆＃39;相关提示＆＃39;，＆＃39; wp_usermeta＆＃39;，＆＃39; ref＆＃39;，＆＃39; user_id，meta_key，FH_DanB_1＆＃ 39;，＆＃39; FH_DanB_1＆＃39;，＆＃39; 776＆＃39;，＆＃39; const，func＆＃39;，＆＃39; 1＆＃39;，＆＃39;使用where＆＃39;

wp_usermeta有超过500k行，但我想我应该将列meta_value编入索引？

不确定我是否可以在语法上更快地进行查询。

这里使用的两个表是wp_posts（post_author，post_date，post_date_gmt，post_content，post_title，post_excerpt，post_status，comment_status，ping_status，post_password，post_name，to_ping，pinged，post_modified，post_modified_gmt，post_content_filtered，post_parent，guid，menu_order，post_type， post_mime_type，comment_count，up，down，popular，robotsmeta，meta_robots）和wp_usermeta（meta_id，user_id，meta_key，meta_value）。 wp_posts.post_author值与wp_usermeta.user_id相同。 Wp_posts有超过100K行，wp_usermeta超过500k。

Answer 1

我无法测试您的查询，但我会这样做：

用内部联接替换IN子句
将meta_value LIKE 'term'替换为meta_value='term'
删除GROUP BY因为联合查询（没有union all子句）已经删除了重复项
在键上添加索引，也可能在某些文本字段上添加索引。

如果我没有犯错，这应该是结果查询：

select wp_usermeta.user_id
from
  wp_usermeta inner join wp_posts wp1
  on wp_usermeta.user_id=wp1.post_author and wp1.post_type='attachment'
  inner join wp_posts wp2
  on wp_usermeta.user_id=wp2.post_author and post_type='article'
where
  wp_usermeta.meta_key='first_name' 
  AND wp_usermeta.meta_value='term' 
  AND length(wp_usermeta.post_content) > 0 
  AND length(wp_usermeta.post_title) > 0 

UNION 

select wp_um1.user_id
from
  wp_usermeta wp_um1 inner join wp_usermeta wp_um2
  on wp_um1.user_id=wp_um2.user_id and wp_um2.meta_key = 'user_type'
     and wp_um2.meta_value = 'user'
  inner join wp_posts wp1
  on wp_usermeta.user_id=wp1.post_author and wp1.post_type='attachment'
  inner join wp_posts wp2
  on wp_usermeta.user_id=wp2.post_author and post_type='article'
where
  wp_um1.meta_key in ('zip', 'city', 'state', 'country')
  AND (wp_um1.meta_value = 'term')
  AND length(wp_um1.post_content) > 0
  AND length(wp_um1.post_title) > 0

编辑：我想尝试的最后一个想法就是这个。你可以替换这部分：

 inner join wp_posts wp1
  on wp_usermeta.user_id=wp1.post_author and wp1.post_type='attachment'
  inner join wp_posts wp2
  on wp_usermeta.user_id=wp2.post_author and post_type='article'

这个：

inner join (select post_author
            from wp_posts
            where post_type in ('attachment','article')
            group by post_author
            having count(*)>1) wp on wp_usermeta.user_id = wp.post_author

取决于您的数据结构如何，它可以使查询更快，但也更慢......

如何加速这个Wordpress Mysql查询？

1 个答案: