php - mysql 查询需要 30 秒执行...太长

Question

我正在尝试运行 MySQL 查询作为网站上的搜索，但它需要很长时间。

我直接从 phpMyAdmin 运行它，大约需要 20 秒才能完成。

这是我正在运行的查询:

SELECT * , bb_business.id AS bid
FROM bb_business
LEFT OUTER JOIN bb_offers ON bb_business.id = bb_offers.store_id
LEFT OUTER JOIN bb_cat_business ON bb_business.id = bb_cat_business.store_id
LEFT OUTER JOIN bb_categories ON bb_categories.id = bb_cat_business.cat_id
WHERE bb_business.active = '1'
AND (
bb_business.business_name LIKE '%altas%'
OR bb_categories.category_name LIKE '%altas%'
OR bb_business.business_name LIKE '%juice%'
OR bb_categories.category_name LIKE '%juice%'
)
AND (
bb_business.city LIKE '%%'
OR bb_business.state LIKE '%%'
OR bb_business.zip LIKE '%%'
)
GROUP BY bb_business.business_name
ORDER BY bb_business.business_name DESC 
LIMIT 1 , 10`

速度:显示第 0 - 0 行(总共 1 行，查询耗时 20.1130 秒)

我不确定向您展示结构的最佳方式。但这里复制并粘贴了一些表格的排序规则:

bb_ach            128 InnoDB latin1_swedish_ci 32.0 KB - 
bb_business       2,862 InnoDB latin1_swedish_ci 1.6 MB - 
bb_categories     15 MyISAM utf8_general_ci 6.7 KB 60 Bytes

bb_cat_business   2,926 MyISAM utf8_general_ci 49.6 KB 17 Bytes

bb_emails         13 MyISAM utf8_general_ci 6.0 KB - 
bb_member         409 MyISAM utf8_general_ci 62.7 KB - 
bb_member_card    593 MyISAM utf8_general_ci 112.1 KB - 
bb_merchant       154 InnoDB latin1_swedish_ci 32.0 KB - 
bb_offers         80 InnoDB latin1_swedish_ci 16.0 KB - 
bb_products       2 InnoDB latin1_swedish_ci 32.0 KB 

如果我还能提供其他信息。请告诉我。

非常感谢您的帮助。

编辑####################################

好吧，根据 OMG Ponies 的建议，我改变了一些东西。制作了一些 MyISAM 内容并创建了一些 FULLTEXT 索引以供使用。

我最终得到了这个查询:

SELECT *, bb_business.id AS bid FROM bb_business 
LEFT OUTER JOIN bb_offers ON bb_business.id = bb_offers.store_id 
LEFT OUTER JOIN bb_cat_business ON bb_business.id = bb_cat_business.store_id 
LEFT OUTER JOIN bb_categories ON bb_categories.id = bb_cat_business.cat_id 
WHERE bb_business.active = '1' AND 
MATCH(bb_business.business_name) AGAINST ('".addslashes($business)."') OR 
MATCH(bb_categories.category_name) AGAINST ('".addslashes($business)."') OR 
MATCH (bb_business.city,bb_business.state,bb_business.zip) AGAINST ('".addslashes($city)."') 
GROUP BY bb_business.business_name 
ORDER BY bb_business.imported,".$this->sortCol." ".$this->sortDirection." LIMIT ".$this->start.",".$this->limit

我认为这让它变得更慢;)

解释给出了这个:

id  select_type  table  type  possible_keys  key  key_len  ref  rows  Extra  
1 SIMPLE bb_business ALL NULL NULL NULL NULL 2877 Using temporary; Using filesort 
1 SIMPLE bb_offers ALL NULL NULL NULL NULL 94   
1 SIMPLE bb_cat_business ALL NULL NULL NULL NULL 5697   
1 SIMPLE bb_categories eq_ref PRIMARY PRIMARY 8 buxback_site.bb_cat_business.cat_id 1 Using where 

因此结果是第一个查询最多需要 40 秒才能完成。如果我再次搜索完全相同的短语，速度正如我期望的 MYSQL 执行的那样。以毫秒为单位。这只是第一次搜索，需要永远...

还有什么想法吗？我很乐意花钱请人帮忙。

Answer 1

从表面上看，这是我的重写:

   SELECT *, bb_business.id AS bid
     FROM bb_business b
LEFT JOIN bb_offers o ON o.store_id = b.id
LEFT JOIN bb_cat_business cb ON cb.store_id = b.id
LEFT JOIN bb_categories c ON c.id = cb.cat_id
    WHERE b.active = '1'
      AND (    bb_business.business_name LIKE '%altas%'
            OR bb_business.business_name LIKE '%juice%'
            OR MATCH(c.category_name) AGAINST ('altas', 'juice'))          
 GROUP BY b.business_name
 ORDER BY b.business_name DESC 
    LIMIT 0, 10

• LIMIT 从 0 开始 - 从 1 开始将省略第一个记录。
• 您可以在 MyISAM 表上使用全文搜索 (FTS) 功能，这就是 MATCH() .. AGAINST 的作用。您可以通过添加全文索引来加快速度...
• SELECT * 是一种不好的方法 - 最好拼写出您真正想要的每个内容