MySQL中的500万行表在select中加入了查询

表格完全填充后,我担心下面的查询的性能.到目前为止,它正处于开发阶段并且在虚拟数据方面表现良好.

表“adress_zoo”将在完全填充后包含大约5亿条记录. “adress_zoo”表看起来像这样:

  CREATE TABLE `adress_zoo` 
     ( `adress_id` int(11) NOT NULL, `zoo_id` int(11) NOT NULL, 
     UNIQUE KEY `pk` (`adress_id`,`zoo_id`), 
     KEY `adress_id` (`adress_id`) ) 
     ENGINE=InnoDB DEFAULT CHARSET=latin1;

其他表格每个最多包含500条记录.

完整查询如下所示:

  SELECT a.* FROM jos_zoo_item AS a 
  JOIN jos_zoo_search_index AS zsi2 ON zsi2.item_id = a.id 
  WHERE a.id IN (   

     SELECT r.id FROM ( 

        SELECT zi.id AS id, Max(zi.priority) as prio 
        FROM jos_zoo_item AS zi 
        JOIN jos_zoo_search_index AS zsi ON zsi.item_id = zi.id 
        LEFT JOIN jos_zoo_tag AS zt ON zt.item_id = zi.id 
        JOIN jos_zoo_category_item AS zci ON zci.item_id = zi.id 
        **JOIN adress_zoo AS az ON az.zoo_id = zi.id** 

        WHERE 1=1 
        AND ( (zci.category_id != 0 AND ( zt.name != 'prolong' OR zt.name is NULL)) 
        OR (zci.category_id = 0 AND zt.name = 'prolong') ) 
        AND zi.type = 'telefoni' 
        AND zsi.element_id = '44d3b1fd-40f6-4fd7-9444-7e11643e2cef' 
        AND zsi.value = 'Small' 
        AND zci.category_id > 15 
        **AND az.adress_id = 5** 

        GROUP BY zci.category_id ) AS r 
  ) 

  AND a.application_id = 6 
  AND a.access IN (1,1) 
  AND a.state = 1 
  AND (a.publish_up = '0000-00-00 00:00:00' OR a.publish_up <= '2012-06-07 07:51:26') 
  AND (a.publish_down = '0000-00-00 00:00:00' OR a.publish_down >= '2012-06-07 07:51:26') 
  AND zsi2.element_id = '1c3cd26e-666d-4f8f-a465-b74fffb4cb14' 

  GROUP BY a.id 
  ORDER BY zsi2.value ASC

查询通常会返回大约25条记录.

根据您的经验,此查询是否可以接受(在3秒内响应)?
我该怎么做才能优化这个?

正如@Jack所建议我用EXPLAIN运行查询并得到了这个:

最佳答案 这部分是一个重要的限制因素:

az.adress_id = 5

MySQL会将表限制为adress_id匹配的记录,然后再将其与语句的其余部分一起加入,因此它取决于您认为结果集的大小.

顺便说一句,你有一个独特的(adress_id,zoo_id)和一个单独的INDEX.有什么特别的原因吗?因为MySQL可以使用生成密钥的第一部分来选择.

同样重要的是使用EXPLAIN来了解MySQL将如何“攻击”您的查询并返回结果.另见:http://dev.mysql.com/doc/refman/5.5/en/execution-plan-information.html

点赞