优化 MySQL 阻止我的后端事务的存储过程

Question

我有这个简单的存储过程，每天执行一次，根据用户拥有的材料数量更新用户的“能量”。但这需要大约 2 分钟才能结束，我想知道是否有更好的方法：

BEGIN
   SET @energy_premium = 10;
    SET @energy_free = 5;

    UPDATE user
    SET energy = @energy_premium
    WHERE id IN (
        SELECT fk_user
        FROM material
        GROUP BY fk_user
        HAVING COUNT(fk_user)>=2 AND user.id = material.fk_user);
        
    UPDATE user
    SET energy = @energy_free
    WHERE id IN (
        SELECT fk_user
        FROM material
        GROUP BY fk_user
        HAVING COUNT(fk_user)=1 AND user.id = material.fk_user);
END

此外，当此存储过程正在执行时，我的后端服务无法对数据库进行事务处理。

Answer 1

测试一下：

BEGIN
    SET @energy_premium = 10;
    SET @energy_free = 5;

    UPDATE user
    JOIN ( SELECT fk_user, CASE COUNT(fk_user) WHEN 1 
                                               THEN @energy_free
                                               ELSE @energy_premium
                                               END energy
           FROM material
           GROUP BY fk_user ) mat ON user.id = mat.fk_user
    SET user.energy = mat.energy;
END;

优化 MySQL 阻止我的后端事务的存储过程

Optimize MySQL stored procedure that is blocking my back-end transactions

mysql

innodb