有没有办法优化这个导致大量数据库使用的查询?完整的查询充满了 ID 记录 - 所以我裁剪为仅
IN (39,40,thousands of products ID's, 29674) GROUP BY
重载记录数:108000528
重载记录的平均数量:216001
重复次数:500
最长/中等查询执行时间:5.494/1.873
加载/返回的平均行数:216040/39
结果为零的问题数量:86
分析的 SQL 查询:
SELECT p.*, product_shop.*, product_shop.id_category_default,
pl.*, MAX(image_shop.`id_image`) id_image, il.legend,
m.name manufacturer_name,
MAX(pa.id_product_attribute) id_product_attribute,
stock.out_of_stock, IFNULL(stock.quantity, 0) as quantity
FROM `psy_category_product` cp
LEFT JOIN psy_category c ON (c.id_category = cp.id_category)
LEFT JOIN `psy_product` p ON p.`id_product` = cp.`id_product`
INNER JOIN psy_product_shop product_shop
ON (product_shop.id_product = p.id_product
AND product_shop.id_shop = 1 )
LEFT JOIN `psy_product_attribute` pa ON (p.`id_product` = pa.`id_product`)
LEFT JOIN psy_product_attribute_shop product_attribute_shop
ON (product_attribute_shop.id_product_attribute = pa.id_product_attribute
AND product_attribute_shop.id_shop = 1
AND product_attribute_shop.`default_on` = 1 )
LEFT JOIN psy_stock_available stock ON (stock.id_product = p.id_product
AND stock.id_product_attribute =
IFNULL(`product_attribute_shop`.id_product_attribute, 0)
AND stock.id_shop = 1 )
LEFT JOIN psy_product_lang pl ON (pl.id_product = p.id_product
AND pl.id_shop = 1
AND pl.id_lang = 1 )
LEFT JOIN `psy_image` i ON (i.`id_product` = p.`id_product`)
LEFT JOIN psy_image_shop image_shop ON (image_shop.id_image = i.id_image
AND image_shop.id_shop = 1
AND image_shop.cover=1 )
LEFT JOIN `psy_image_lang` il ON (image_shop.`id_image` = il.`id_image`
AND il.`id_lang` = 1 )
LEFT JOIN psy_manufacturer m ON (m.id_manufacturer = p.id_manufacturer)
WHERE product_shop.`active` = 1
AND product_shop.`visibility` IN ("both", "catalog")
AND c.id_category = 15
AND c.active = 1
AND p.id_product IN (39,40,thousands of products ID's, 29674)
GROUP BY product_shop.id_product
ORDER BY cp.position asc
LIMIT 48,48;
最佳答案
`` 闻起来像一个多对多映射表。按照提示操作 here .
然后,让我们开始关注查询的关键部分:
SELECT p.`id_product`,
ps.id_category_default
FROM `psy_category_product` cp
LEFT JOIN psy_category c ON (c.id_category = cp.id_category)
LEFT JOIN `psy_product` p ON p.`id_product` = cp.`id_product`
INNER JOIN psy_product_shop AS ps
ON ps.id_product = p.id_product
AND ps.id_shop = 1
WHERE ps.`active` = 1
AND ps.`visibility` IN ("both", "catalog")
AND c.id_category = 15
AND c.active = 1
AND p.id_product IN (39,40,29674)
GROUP BY ps.id_product
ORDER BY cp.position asc
LIMIT 10;
(调整 id_product 列表,以便出现一些内容。)
请为这 3 个表提供SHOW CREATE TABLE
,以及EXPLAIN SELECT ...
。
表的其余部分似乎只是查找。
尚不清楚是否需要GROUP BY
。如果不是,则将其删除。
关于jquery - 非常大的 Prestashop MySQL 查询会导致大量数据库使用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46359870/