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將Prestashop實例從MySQL遷移到MariaDB後,過濾後的搜索查詢變慢。這是一個這樣慢的查詢的例子。從MySQL遷移到MariaDB後,Prestashop搜索速度變慢
SELECT
fl.name feature_name,
fp.id_feature,
fv.id_feature_value,
fvl.value,
COUNT(DISTINCT p.id_product) nbr,
lifl.url_name name_url_name,
lifl.meta_title name_meta_title,
lifvl.url_name value_url_name,
lifvl.meta_title value_meta_title,
psi.price_min,
psi.price_max,
m.name
FROM
ps_feature_product fp
INNER JOIN
ps_product p
ON
(p.id_product = fp.id_product)
LEFT JOIN
ps_feature_lang fl
ON
(
fl.id_feature = fp.id_feature AND fl.id_lang = 2
)
INNER JOIN
ps_feature_value fv
ON
(
fv.id_feature_value = fp.id_feature_value AND(
fv.custom IS NULL OR fv.custom = 0
)
)
LEFT JOIN
ps_feature_value_lang fvl
ON
(
fvl.id_feature_value = fp.id_feature_value AND fvl.id_lang = 2
)
LEFT JOIN
ps_layered_indexable_feature_lang_value lifl
ON
(
lifl.id_feature = fp.id_feature AND lifl.id_lang = 2
)
LEFT JOIN
ps_layered_indexable_feature_value_lang_value lifvl
ON
(
lifvl.id_feature_value = fp.id_feature_value AND lifvl.id_lang = 2
)
INNER JOIN
ps_product_shop product_shop
ON
(
product_shop.id_product = p.id_product AND product_shop.id_shop = 1
)
INNER JOIN
`ps_layered_price_index` psi
ON
(
psi.id_product = p.id_product AND psi.id_currency = 2 AND psi.id_shop = 1
)
LEFT JOIN
`ps_manufacturer` m
ON
(
m.id_manufacturer = p.id_manufacturer
)
WHERE
product_shop.`active` = 1 AND product_shop.`visibility` IN("both", "catalog") AND fp.id_feature = 9 AND p.id_product IN(
SELECT
id_product
FROM
ps_category_product cp
INNER JOIN
ps_category c
ON
(
c.id_category = cp.id_category AND c.id_category = 13 AND c.active = 1
)
) AND p.id_product IN(
SELECT
id_product
FROM
ps_feature_product fp
WHERE
fp.`id_feature_value` = 39
) AND p.id_product IN(
SELECT
id_product
FROM
ps_feature_product fp
WHERE
fp.`id_feature_value` = 18
) AND p.id_product IN(
SELECT
id_product
FROM
ps_feature_product fp
WHERE
fp.`id_feature_value` = 13
) AND p.id_product IN(
SELECT
id_product
FROM
ps_feature_product fp
WHERE
fp.`id_feature_value` = 44
) AND p.id_product IN(
SELECT
id_product
FROM
ps_feature_product fp
WHERE
fp.`id_feature_value` = 3186
)
GROUP BY
fv.id_feature_value
ORDER BY
fv.position
有趣的是,它得到了很多更快(4S VS 0.4秒),如果多一個(幾乎相同)的子查詢的WHERE子句中被刪除。
... AND
/*
-- removing any of the six product filters makes
-- the query a lot faster
p.id_product IN(
SELECT
id_product
FROM
ps_feature_product fp
WHERE
fp.`id_feature_value` = 18
)
*/
AND ...
下面是這個查詢的EXPLAIN輸出(沒有修改)。
是否有什麼東西明顯,需要以某種方式改變了嗎?所有表格都已經優化,沒有任何改進。
爲什麼你最後有5個相同的子查詢?難道你不能只用'where fp.id_feature_value = 39或fp.id_feature_value = 18'來創建一個子查詢,依此類推? – TheDrot
進行查詢的軟件是Prestashop – Andris