extremly slow sql query

[GerryCze]

Hi, this query copying to tmp tables for many seconds so it is extremly slow. Is it there a posibility to make this query more efective? The version of Prestashop is 1.6.0.11.

 

SELECT p.*, product_shop.*, stock.out_of_stock, IFNULL(stock.quantity, 0) as quantity, MAX(product_attribute_shop.id_product_attribute) id_product_attribute, MAX(product_attribute_shop.minimal_quantity) AS product_attribute_minimal_quantity, pl.`description`, pl.`description_short`, pl.`available_now`,

                                        pl.`available_later`, pl.`link_rewrite`, pl.`meta_description`, pl.`meta_keywords`, pl.`meta_title`, pl.`name`, MAX(image_shop.`id_image`) id_image,

                                        MAX(il.`legend`) as legend, m.`name` AS manufacturer_name, cl.`name` AS category_default,

                                        DATEDIFF(product_shop.`date_add`, DATE_SUB(NOW(),

                                        INTERVAL 100

                                               DAY)) > 0 AS new, product_shop.price AS orderprice

                                FROM `ps_category_product` cp

                                LEFT JOIN `ps_product` p

                                        ON p.`id_product` = cp.`id_product`

                                 INNER JOIN ps_product_shop product_shop

                ON (product_shop.id_product = p.id_product AND product_shop.id_shop = 1)LEFT JOIN `ps_product_attribute` pa

                                ON (p.`id_product` = pa.`id_product`)

                                 LEFT JOIN ps_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 ps_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  AND stock.id_shop_group = 0  )

                                LEFT JOIN `ps_category_lang` cl

                                        ON (product_shop.`id_category_default` = cl.`id_category`

                                        AND cl.`id_lang` = 4 AND cl.id_shop = 1 )

                                LEFT JOIN `ps_product_lang` pl

                                        ON (p.`id_product` = pl.`id_product`

                                        AND pl.`id_lang` = 4 AND pl.id_shop = 1 )

                                LEFT JOIN `ps_image` i

                                        ON (i.`id_product` = p.`id_product`) LEFT JOIN ps_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 `ps_image_lang` il

                                        ON (image_shop.`id_image` = il.`id_image`

                                        AND il.`id_lang` = 4)

                                LEFT JOIN `ps_manufacturer` m

                                        ON m.`id_manufacturer` = p.`id_manufacturer`

                                WHERE product_shop.`id_shop` = 1

                                        AND cp.`id_category` = 2278 AND product_shop.`active` = 1 AND product_shop.`visibility` IN ("both", "catalog") GROUP BY product_shop.id_product ORDER BY `reference` asc

                        LIMIT 0,12

[tuk66]

Try EXPLAIN SELECT p.*, product_shop.*, stock.out_of_stock... in phpMyAdmin to identify a bottleneck.

[rvcat]

it comes from where this query ?