我在带有MySQL5.6数据库的prestashop 1.6上工作，该数据库具有更多的7Gb。当我想在我的prestashop上看到我的订单时，这是一个非常大的问题，它需要40到2分钟之间的时间，有时会卡住。
我提到我们处理的订单超过了80.000个，而我们有200.000个产品。我们尝试了许多优化方法，例如索引编制，并最大限度地利用了子查询。
我们有更好的时间，但是仍然很慢。我尝试直接在mysql上执行该请求，但有时我可变为50s，有时可变为200s，差异很大。
/*Request prestashop*/
SELECT SQL_CALC_FOUND_ROWS a.id_order ,invoice_number,address.id_country
AS id_country, total_paid_tax_incl,payment, a.date_add
AS date_add , a.id_currency, a.id_order
AS id_pdf, CONCAT(LEFT(c.firstname, 1), '. ', c.lastname)
AS customer, osl.name
AS osname, os.color,
IF((
SELECT so.id_order
FROM ps_orders so
WHERE so.id_customer = a.id_customer AND so.id_order < a.id_order
LIMIT 1
) > 0, 0, 1) AS new,
country_lang.name
AS cname,
IF(a.valid, 1, 0) badge_success,a.total_products,a.reference
AS reference,
/*Override request pesonalized*/
(
SELECT GROUP_CONCAT( DISTINCT pr.product_group SEPARATOR ", ") /*DISTINCT*/
FROM ps_order_detail dod
LEFT JOIN ps_product pr ON (pr.id_product = dod.product_id)
WHERE dod.id_order = a.id_order LIMIT 1
) AS product_group,
(
SELECT GROUP_CONCAT(hdb.product_reference SEPARATOR ", ")
FROM ps_order_detail hdb
WHERE hdb.id_order = a.id_order
) AS sku,
(
SELECT GROUP_CONCAT(rop.id_order_lengow SEPARATOR ", ")
FROM ps_lengow_orders rop
WHERE rop.id_order = a.id_order
) AS marketplace,
(
SELECT name
FROM ps_supplier
WHERE id_supplier = (
SELECT id_supplier FROM ps_product WHERE id_product = (
SELECT product_id FROM ps_order_detail rypl
WHERE rypl.id_order = a.id_order
LIMIT 1
)
)
)
AS fournisseur,
lo.id_order_lengow,
IF(lo.marketplace IS NOT NULL, lo.marketplace, 'royalprice') AS marketplace_name,
(
SELECT SUM(
IF ( lo.marketplace IS NULL AND 4 IN
(
SELECT ps.id_supplier
FROM ps_product_supplier ps
WHERE p.id_product=ps.id_product
)
AND (
SELECT cpp.price
FROM ps_cdiscount_products_price cpp
WHERE cpp.sku=p.reference LIMIT 1
) IS NOT NULL,
(
SELECT cpp.price
FROM ps_cdiscount_products_price cpp
WHERE cpp.sku=p.reference LIMIT 1
),
p.wholesale_price
)
)
FROM ps_product p
WHERE p.id_product IN (
SELECT od.product_id AS id_product
FROM ps_order_detail od
WHERE od.id_order = a.id_order
)
) AS total_wolesale,
(
SELECT mrp.margin_value
FROM ps_margin_rp mrp
WHERE mrp.id_order=a.id_order
LIMIT 1
) AS margin_rp_value ,
(
SELECT mmax.margin_value
FROM ps_margin_max mmax
WHERE mmax.id_order=a.id_order
LIMIT 1
) AS margin_max_value ,
address.postcode
FROM ps_orders a
LEFT JOIN ps_customer c ON (c.id_customer = a.id_customer)
INNER JOIN ps_address address ON address.id_address = a.id_address_delivery
INNER JOIN ps_country country ON address.id_country = country.id_country
INNER JOIN ps_country_lang country_lang ON (country.id_country = country_lang.id_country AND country_lang.id_lang = 1)
LEFT JOIN ps_order_state os ON (os.id_order_state = a.current_state)
LEFT JOIN ps_order_state_lang osl ON (os.id_order_state = osl.id_order_state AND osl.id_lang = 1)
LEFT JOIN ps_lengow_orders lo ON (lo.id_order = a.id_order)
WHERE 1 AND lo.marketplace IN ("Amazon","Ebay_fr")
ORDER BY a.id_order DESC LIMIT 0,300
我不明白为什么要花这么长时间。我怎样才能更快？
注意：： @RemcoK，我运行解释，我明白了 EXPLAIN RUN ALL !INDEX PHOTO
