mysql 快速生成百万条测试数据

朴灿烈づ我的快乐病毒、 2022-08-09 06:26 217阅读 0赞

## 1、生成思路 ##

利用mysql内存表插入速度快的特点，先利用函数和存储过程在内存表中生成数据，然后再从内存表插入普通表中

## 2、创建内存表及普通表 ##

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、创建函数及存储过程 ##

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、调用存储过程 ##

CALL add_vote_memory(1000000)

根据电脑性能不能所花时间不一样，大概时间在小时级别，如果报错内存满了，只在修改max\_heap\_table\_size 个参数即可，win7修改位置如下，linux，修改my.cnf文件，修改后要重启mysql，重启后内存表数据会丢失

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## 5、插入普通表中 ##

INSERT into vote_record SELECT * from  vote_record_memory

## 6、结果 ##

![Center 1][]

![Center 2][]

[Center]: /images/20220731/f1ae00ef49c1469f9d0a118365728277.png
[Center 1]: /images/20220731/dcf6bc21a53b41a7bd4981285a231fd0.png
[Center 2]: /images/20220731/19e06ab6edb14d4f98fd0db0bdb63d09.png