mysql 快速生成百万条测试数据

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

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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

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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

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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

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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

5、插入普通表中

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INSERT into vote_record SELECT * from vote_record_memory