Wordpress 非常慢的查询

Question

I have this query

SELECT DISTINCT t.*
              , tt.* 
           FROM wp_terms t  
           JOIN wp_termmeta 
             ON t.term_id = wp_termmeta.term_id 
           JOIN wp_termmeta mt1 
             ON t.term_id = mt1.term_id 
           JOIN wp_termmeta mt2 
             ON t.term_id = mt2.term_id 
           JOIN wp_term_taxonomy tt 
             ON t.term_id = tt.term_id 
          WHERE tt.taxonomy IN ('episodes') 
            AND wp_termmeta.meta_key = 'episode_number'  
            AND mt1.meta_key = 'tr_id_post' 
            AND mt1.meta_value = '7547' 
            AND mt2.meta_key = 'season_number' 
            AND mt2.meta_value = '2' 
          ORDER 
             BY wp_termmeta.meta_value+0 ASC;

I don't know how to make it faster, it takes like 1.2 sec to execute, my website loads very hard because of it.

Answer 1

How big is the table? Check to see if a plugin is flooding that table with junk that it fails to clear out.

The "meta" tables have an inefficient schema. This explains what to do to improve the performance of them: http://mysql.rjweb.org/doc.php/index_cookbook_mysql#speeding_up_wp_postmeta