A practical tutorial on how to quickly insert tens of millions of records into MySQL

CREATE TABLE `dept` (
 `id` int(11) NOT NULL,
 `deptno` mediumint(9) DEFAULT NULL,
 `dname` varchar(20) DEFAULT NULL,
 `loc` varchar(13) DEFAULT NULL,
 PRIMARY KEY (`id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `emp` (
 `id` int(11) NOT NULL,
 `empon` mediumint(9) DEFAULT NULL COMMENT 'Number',
 `ename` varchar(20) DEFAULT NULL,
 `job` varchar(9) DEFAULT NULL,
 `mgr` mediumint(9) DEFAULT NULL COMMENT 'Superior number',
 `hirdate` datetime DEFAULT NULL COMMENT 'Job start time',
 `sal` decimal(7,2) DEFAULT NULL COMMENT 'Salary',
 `comm` decimal(7,2) DEFAULT NULL COMMENT 'Dividend',
 `deptno` mediumint(9) DEFAULT NULL COMMENT 'Department number',
 PRIMARY KEY (`id`)
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

DELIMITER $
CREATE FUNCTION RAND_STR(n INT) RETURNS VARCHAR(255)
BEGIN
 DECLARE chars_str VARCHAR(100) DEFAULT 'abcdefghijklmnopqrstuvwsyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
	 DECLARE return_str VARCHAR(255) DEFAULT '';
 DECLARE i INT DEFAULT 0;
	 WHILE i< n DO 
	 SET return_str = COUCAT(return_str,SUBSTRING(chars_str,FLOOR(1+RAND()*52),1));
	 SET i= i+1;
 END WHILE;
	 RETURN return_str;
END $

DELIMITER $
CREATE FUNCTION RAND_num() RETURNS INT(5)
BEGIN
 DECLARE i INT DEFAULT 0; 
	 SET i= FLOOR(100+RAND()*10);
	 RETURN i;
END $

DELIMITER $
CREATE PROCEDURE insert_emp(IN START INT(10),IN max_num INT(10))
BEGIN
  DECLARE i INT DEFAULT 0;
		SET autocommit = 0;
		REPEAT #Repeat SET i = i + 1;
		INSERT INTO emp(empon,ename,job,mgr,hiredate,sal,comm,depton) VALUES ((START+i),RAND_STR(6),'SALESMAN',0001,CURDATE(),2000,400,RAND_num());
	 UNTIL i = max_num
 END REPEAT;
	 COMMIT;
END $

DELIMITER $
CREATE PROCEDURE insert_dept(IN START INT(10), IN max_num INT(10))
BEGIN
  DECLARE i INT DEFAULT 0;
		SET autocommit = 0;
		REPEAT #Repeat SET i = i + 1;
		INSERT INTO dept(deptno,dname,loc) VALUES ((START+i),RAND_STR(10),RAND_STR(8));
	 UNTIL i = max_num
 END REPEAT;
	 COMMIT;
END $