Slow MySQL query with Laravel Eloquent

Question

I'm using Laravel Eloquent and debuging why this query is taking so long:

select count(*) as aggregate 
from `custom_products` 
where `hidden` = '0' 
and (`company_id` = '1')
and exists (
   select * from `categories` 
   inner join `categorizables` on `categories`.`id` = `categorizables`.`category_id` 
   where `custom_products`.`id` = `categorizables`.`categorizable_id`
   and `categorizables`.`categorizable_type` = 'App\Models\CustomProduct' 
   and `categories`.`deleted_at` is null) 
and exists (
   select * from `images` 
   where `custom_products`.`id` = `images`.`imageable_id` 
   and `images`.`imageable_type` = 'App\Models\CustomProduct' 
   and `images`.`deleted_at` is null) 
and `custom_products`.`deleted_at` is null

Sometimes it runs very slow: it tooks 17.46s to run as you see in this image from debugbar:

Anyone knows why?

Answer 1

images . imageable_id is that the PRIMARY KEY ? Provide SHOW CREATE TABLE for each table.

What indexes are there on custom_products ? It needs

INDEX(company_id, hidden, deleted_at)

On a different topic, I think you have a bug in 'App\\Models\\CustomProduct' -- backslash is the escape character, not a directory separator. Probably you need 'App\\\\Models\\\\CustomProduct'

Answer 2

Try to add these indexes to optimize the query:

ALTER TABLE `categories` ADD INDEX `categories_idx_at_id` (`deleted_at`,`id`);
ALTER TABLE `categorizables` ADD INDEX `categorizables_idx_type_id_id` (`categorizable_type`,`category_id`,`categorizable_id`);
ALTER TABLE `custom_products` ADD INDEX `custom_products_idx_hidden_id_at` (`hidden`,`company_id`,`deleted_at`);
ALTER TABLE `custom_products` ADD INDEX `custom_products_idx_id` (`id`);
ALTER TABLE `images` ADD INDEX `images_idx_type_at_id` (`imageable_type`,`deleted_at`,`imageable_id`);