Hi,

we upgraded MariaDB 5.5 to 10.0 on one server last night and are now
dealing with severe performance issues. Here is one case where it's
notable:

Query - SELECT b.*, p.category_id FROM brands b JOIN products p
USING(brand_id) GROUP BY category_id, brand_id ORDER BY title ASC;

Table structures:

CREATE TABLE `brands` (
   `brand_id` int(11) NOT NULL AUTO_INCREMENT,
   `title` varchar(50) NOT NULL,
   `slug` varchar(50) NOT NULL,
   `description` text NOT NULL,
   `discount_suv_1` float NOT NULL,
   `discount_suv_2` float NOT NULL,
   `discount_van_1` float NOT NULL,
   `discount_van_2` float NOT NULL,
   `discount_orp_1` float NOT NULL,
   `discount_orp_2` float NOT NULL,
   PRIMARY KEY (`brand_id`)
) ENGINE=InnoDB AUTO_INCREMENT=150 DEFAULT CHARSET=utf8


CREATE TABLE `products` (
   `product_id` int(11) NOT NULL AUTO_INCREMENT,
   `category_id` int(11) DEFAULT NULL,
   `featured_image_id` int(11) DEFAULT NULL,
   `brand_id` int(11) DEFAULT NULL,
   `title` text NOT NULL,
   `slug` text NOT NULL,
   `price` float NOT NULL,
   `custom_price` float NOT NULL,
   `description` text NOT NULL,
   `hidden` tinyint(1) NOT NULL,
   `homepage` tinyint(1) NOT NULL,
   `sale` tinyint(1) NOT NULL,
   `width` float NOT NULL,
   `height` int(11) NOT NULL,
   `diameter` int(11) NOT NULL,
   `resistance` varchar(50) NOT NULL,
   `breaking_distance` varchar(50) NOT NULL,
   `noise` varchar(50) NOT NULL,
   `ean` varchar(50) NOT NULL,
   `availability` char(1) NOT NULL,
   `li` varchar(15) NOT NULL,
   `si` varchar(15) NOT NULL,
   `classes` varchar(5) NOT NULL,
   `all_year` tinyint(1) NOT NULL,
   `type` char(3) NOT NULL,
   `holes_count` float NOT NULL,
   `pitch` float NOT NULL,
   `et` float NOT NULL,
   `code` varchar(50) NOT NULL,
   `custom` tinyint(1) NOT NULL,
   `car_type` varchar(100) NOT NULL,
   `models` text NOT NULL,
   `imported` tinyint(1) NOT NULL,
   `is_runflat` tinyint(1) NOT NULL,
   `stock_count` int(11) NOT NULL,
   `parser` char(1) NOT NULL,
   PRIMARY KEY (`product_id`),
   KEY `category_id` (`category_id`),
   KEY `featured_image_id` (`featured_image_id`),
   KEY `brand_id` (`brand_id`),
   KEY `slug` (`slug`(100)),
   KEY `hidden` (`hidden`),
   CONSTRAINT `products_ibfk_1` FOREIGN KEY (`category_id`) REFERENCES
`categories` (`category_id`) ON DELETE SET NULL,
   CONSTRAINT `products_ibfk_4` FOREIGN KEY (`featured_image_id`)
REFERENCES `product_images` (`product_image_id`) ON DELETE SET NULL,
   CONSTRAINT `products_ibfk_5` FOREIGN KEY (`brand_id`) REFERENCES
`brands` (`brand_id`) ON DELETE SET NULL
) ENGINE=InnoDB AUTO_INCREMENT=63638 DEFAULT CHARSET=utf8



Table brands: 149 rows
Table products: 62074 rows



Query time on 5.5: about 0.2s
Query time on 10.0: between 2 and 9s (if not cached)

Explain on 5.5: http://watchdog.sk/5.5.png
Explain on 10.0: http://watchdog.sk/10.png


Any hints what's going on? What about the difference in the explain command?

Thank you.

azur



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