轉 https://blog.csdn.net/gooooa/article/details/54691590

1、生成思路
利用mysql內存表插入速度快的特點，先利用函數和存儲過程在內存表中生成數據，然後再從內存表插入普通表中
2、創建內存表及普通表

CREATE TABLE `vote_record_memory` (
    `id` INT (11) NOT NULL AUTO_INCREMENT,
    `user_id` VARCHAR (20) NOT NULL,
    `vote_id` INT (11) NOT NULL,
    `group_id` INT (11) NOT NULL
 
,
    `create_time` datetime NOT NULL,
    PRIMARY KEY (`id`),
    KEY `index_id` (`user_id`) USING HASH
) ENGINE = MEMORY AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8

CREATE TABLE `vote_record` (
    `id` INT (11) NOT NULL AUTO_INCREMENT,
    `user_id` VARCHAR (20) NOT NULL,
    `vote_id` INT (11) NOT
 
 NULL,
    `group_id` INT (11) NOT NULL,
    `create_time` datetime NOT NULL,
    PRIMARY KEY (`id`),
    KEY `index_user_id` (`user_id`) USING HASH
) ENGINE = INNODB AUTO_INCREMENT = 1 DEFAULT CHARSET = utf8

3、創建函數及存儲過程

CREATE FUNCTION `rand_string`(n INT) RETURNS varchar(255) CHARSET latin1
BEGIN
 
 
DECLARE chars_str varchar(100) DEFAULT ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789‘; 
DECLARE return_str varchar(255) DEFAULT ‘‘ ;
DECLARE i INT DEFAULT 0; 
WHILE i < n DO 
SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*62 ),1)); 
SET i = i +1; 
END WHILE; 
RETURN return_str; 
END

CREATE  PROCEDURE `add_vote_memory`(IN n int)
BEGIN  
  DECLARE i INT DEFAULT 1;
    WHILE (i <= n ) DO
      INSERT into vote_record_memory  (user_id,vote_id,group_id,create_time ) VALUEs (rand_string(20),FLOOR(RAND() * 1000),FLOOR(RAND() * 100) ,now() );
            set i=i+1;
    END WHILE;
END

4、調用存儲過程

CALL add_vote_memory(1000000)

根據電腦性能不能所花時間不一樣，大概時間在小時級別，如果報錯內存滿了，只在修改max_heap_table_size 個參數即可，win7修改位置如下，linux，修改my.cnf文件，修改後要重啟mysql，重啟後內存表數據會丟失

5、插入普通表中

INSERT into vote_record SELECT * from  vote_record_memory

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6、結果

mysql 快速生成百萬條測試數據