我的 sql 查询在 7 亿行表中花费时间也有限制

Question

Hello team,

I am facing issue related to fetch data from a table of 700 million rows with limit also. Below is the complete detail of our scenario:-

I am having a table with 700 million rows here is table structure:-

   CREATE TABLE `product_items` (
      `id` int(11) NOT NULL,
      `product_id` int(11) NOT NULL,
      `item_id` int(11) NOT NULL,
      `model_id` int(11) DEFAULT NULL,
      `value` varchar(255) NOT NULL,
      `engine_size` varchar(255) DEFAULT NULL,
      `position` varchar(255) DEFAULT NULL,
      `vehicle_attributes` varchar(255) DEFAULT NULL,
      `application_notes` varchar(255) DEFAULT NULL,
      `status` tinyint(1) NOT NULL DEFAULT '1',
      `created_date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE `product_items` ADD INDEX(`product_id`); 
ALTER TABLE `product_items` ADD INDEX(`item_id`); 
ALTER TABLE `product_items` ADD INDEX(`value`); 
ALTER TABLE `product_items` ADD INDEX(`model_id`); 
ALTER TABLE `product_items` ADD INDEX(`engine_size`); 


ALTER TABLE `product_items` ADD PRIMARY KEY (`id`);

Related to this data Product_id =2 model_id = 1615 item_id =1 total 2 results are there.

when i run this query It give results in.5 secs as per screenshot:

SELECT `product_items`.* FROM (`product_items`)  WHERE `product_items`.`status` =  '1' AND `product_items`.`item_id` =  1
AND `product_items`.`product_id` =  '2' AND `product_items`.`model_id` =  '1615'  limit 2;

But when i run this query:-

 SELECT `product_items`.* FROM (`product_items`)  WHERE `product_items`.`status` =  '1' AND `product_items`.`item_id` =  1
    AND `product_items`.`product_id` =  '2' AND `product_items`.`model_id` =  '1615'  limit 10;

It take takes too much time and do not show results after 20 minutes.

We are using digital-ocean database service with 6 CPU + 16 GB + 270 GB Disk

If anyone can help us in this case will be much appreciated.

Answer 1

You have to add some indexes, one of them is this one:

ALTER TABLE `product_items` ADD INDEX `product_items_index` (status, item_id, product_id, model_id)

Also add primary key constraint:

ALTER TABLE product_items ADD PRIMARY KEY(id);

for more info check here