最近，我们将一个db从mariadb 10.2切换到percona服务器（MySQL5.7），我们有一个大约需要15秒的查询（在0.5之前），因为查询优化程序没有在主表上使用任何索引。因为应用程序逻辑，我们不能改变查询格式，我们需要使数据库使用索引。
查询结构很简单：

EXPLAIN SELECT `clients`.`id` AS `t0_c0`,
       `client`.`name1` AS `t0_c1`,
       `client`.`name2` AS `t0_c2`,
       `users`.`id` AS `t1_c0`,
       `users`.`suffix` AS `t1_c1`,
       `users`.`position` AS `t1_c2`,
       `users`.`first_name` AS `t1_c3`,
       `users`.`last_name` AS `t1_c4`,
       `privateData`.`id` AS `t2_c0`,
       `privateData`.`first_name` AS `t2_c1`,
       `privateData`.`last_name` AS `t2_c2`,
       `tariff`.`id` AS `t3_c0`,
       `tariff`.`provider_id` AS `t3_c1`,
       `tariff`.`tariff_type` AS `t3_c2`,
       `tariff`.`name` AS `t3_c3`,
       `providers`.`id` AS `t4_c0`,
       `providers`.`name1` AS `t4_c1`,
       `providers`.`name2` AS `t4_c2`,
       `addresses`.`id` AS `t5_c0`,
       `addresses`.`zipcode` AS `t5_c1`,
       `addresses`.`country` AS `t5_c2`,
       `addresses`.`city` AS `t5_c3`,
       `private`.`id` AS `t6_c0`,
       `private`.`first_name` AS `t6_c1`,
       `private`.`last_name` AS `t6_c2`,
       `commercial`.`id` AS `t7_c0`,
       `commercial`.`name1` AS `t7_c1`,
       `commercial`.`name2` AS `t7_c2`,
       `commercial`.`name_on_invoice` AS `t7_c3`,
       `commercial`.`organization_type` AS `t7_c4`,
       `organizations`.`id` AS `t8_c0`,
       `organizations`.`person_id` AS `t8_c1`,
       `organizations`.`address_id` AS `t8_c2`,
       `organizations`.`status` AS `t8_c3`,
       `shaddresses`.`id` AS `t9_c0`,
       `shaddresses`.`zipcode` AS `t9_c1`,
       `shaddresses`.`country` AS `t9_c2`,
       `shaddresses`.`city` AS `t9_c3`,
       `shprivate`.`id` AS `t10_c0`,
       `shprivate`.`first_name` AS `t10_c1`,
       `shprivate`.`last_name` AS `t10_c2`,
       `coraddresses`.`id` AS `t11_c0`,
       `coraddresses`.`zipcode` AS `t11_c1`,
       `coraddresses`.`country` AS `t11_c2`,
       `corprivate`.`id` AS `t12_c0`,
       `corprivate`.`first_name` AS `t12_c1`,
       `corprivate`.`last_name` AS `t12_c2`,
FROM `client` `client`
LEFT OUTER JOIN `users` `users` ON (`client`.`user_id`=`users`.`id`)
AND (users.status!=5)
LEFT OUTER JOIN `private` `privateData` ON (`users`.`person_id`=`privateData`.`id`)
LEFT OUTER JOIN `tariff` `tariff` ON (`client`.`rate_id`=`tariff`.`id`)
LEFT OUTER JOIN `providers` `providers` ON (`client`.`provider_id`=`providers`.`id`)
LEFT OUTER JOIN `addresses` `addresses` ON (`client`.`main_address_id`=`addresses`.`id`)
LEFT OUTER JOIN `private` `private` ON (`client`.`main_person_id`=`private`.`id`)
LEFT OUTER JOIN `commercial` `commercial` ON (`client`.`main_organization_id`=`commercial`.`id`)
LEFT OUTER JOIN `organizations` `organizations` ON (`client`.`id_organization`=`organizations`.`id`)
AND (organizations.status!=5)
LEFT OUTER JOIN `addresses` `shaddresses` ON (`client`.`shipping_address_id`=`shaddresses`.`id`)
LEFT OUTER JOIN `private` `shprivate` ON (`client`.`shipping_person_id`=`shprivate`.`id`)
LEFT OUTER JOIN `addresses` `coraddresses` ON (`client`.`correspondense_address_id`=`coraddresses`.`id`)
LEFT OUTER JOIN `private` `corprivate` ON (`client`.`correspondense_person_id`=`corprivate`.`id`)
WHERE (client.status!=5)
ORDER BY client.id DESC
LIMIT 10
OFFSET 10

我可以更改任何索引，但是，我不能更改查询。在旧主机上，它的运行时间为0.2秒，但Optimizer使用的是clients表中的索引。使用percona服务器（MySQL5.7）需要15秒。Optimizer没有使用clients表中的任何索引。对于clients表中的force incex（），将在1秒以下运行（对于复合索引，将在0.2秒左右运行）。表'providers'只有一行。我在“clients”表上设置了索引，但在解释中，它们并没有显示为可能的键。
我试图将mysql变量“max\u seeks\u for \u key”设置为1，但是它仍然没有使用索引。
我想我遗漏了一些基本的东西，但我不知道是什么。
此查询的解释是：

orderby正在生成临时表，并且正在使用所有的资源（没有orderby的情况下，运行时间不到一秒钟，甚至没有索引）。
任何想法都是值得赞赏的。