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  1. MariaDB Server
  2. MDEV-25008

Delete query gets stuck on mariadb , same query works on MySQL 8.0.21

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      There is a query in my application to delete duplicate records (specific fields), this query used to work fine on MySQL (v 8.0.21) on Windows 10 and takes about a minute,

      When I migrated to MariaDB 10.5.9 on Ubuntu 20.04 , this query stucks, I left it for +6 hours and it didn't come back.

      The table has about 4 million records, table is:

      CREATE TABLE `item_variant_price` (
        `seller_variant_id` int(11) NOT NULL AUTO_INCREMENT,
        `item_id` varchar(100) DEFAULT NULL,
        `price` float DEFAULT NULL,
        `seller_name` varchar(400) DEFAULT NULL,
        `variant` varchar(400) DEFAULT NULL,
        `is_fulfilled` int(11) NOT NULL DEFAULT 0,
        `insertion_date` timestamp NOT NULL DEFAULT current_timestamp(),
        `modification_date` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
        `is_main_page` int(11) DEFAULT 0,
        `is_cheapest` int(11) NOT NULL DEFAULT 0,
        `variant_url` varchar(400) DEFAULT NULL,
        PRIMARY KEY (`variant_id`),
        FULLTEXT KEY `item_variant_price_serial_IDX` (`item_id`,`seller_name`,`variant`)
      ) ENGINE=InnoDB AUTO_INCREMENT=4309337 DEFAULT CHARSET=utf8mb4;
      
      

      and this is the query:

      delete from item_variant_price where seller_variant_id not in (select m from (select max(seller_variant_id) m from item_variant_price group by item_id, seller_name, variant) as innerTable);
      

      the inner select statement takes 27 seconds, so there has to be an issue with delete ?

      Thanks for your support

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            Assignee:
            psergei Sergei Petrunia
            Reporter:
            ahmedadel47 Ahmed Wahba
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