MySQL里bool类型字段是否需要添加索引测试

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测试环境

AMD A8-7650K + 8G + 1TB + Win7 x64
MySQL Community Server v5.5.47

随机生成3276800条记录

insert into `test_index` values(null,round(rand()),round(rand())); -- 重复N次
insert into `test_index` select null,is_haveindex,is_noindex from `test_index`; -- 重复N次

各种字段记录数

+---------------------------------------+
|    is_haveindex   |    is_noindex     |
|---------|---------|---------|---------|
|    1    |    0    |    1    |    0    |
|---------|---------|---------|---------|
| 1458176 | 1818624 | 1671168 | 1605632 |
+---------------------------------------+

MyISAM引擎

CREATE TABLE `test_index` (
  `id` int(11) NOT NULL AUTO_INCREMENT,  `is_haveindex` tinyint(4) DEFAULT NULL,  `is_noindex` tinyint(4) DEFAULT NULL,
  PRIMARY KEY (`id`),  KEY `is_haveindex` (`is_haveindex`)
) ENGINE=MyISAM AUTO_INCREMENT=3276801 DEFAULT CHARSET=utf8mb4;

select count(*) from test_index where is_haveindex=1
时间: 0.469s
select count(*) from test_index where is_haveindex=0
时间: 0.733s

select count(*) from test_index where is_noindex=1
时间: 0.224s
select count(*) from test_index where is_noindex=0
时间: 0.225s

InnoDB引擎

CREATE TABLE `test_index` (
  `id` int(11) NOT NULL AUTO_INCREMENT,  `is_haveindex` tinyint(4) DEFAULT NULL,  `is_noindex` tinyint(4) DEFAULT NULL,
  PRIMARY KEY (`id`),  KEY `is_haveindex` (`is_haveindex`)
) ENGINE=InnoDB AUTO_INCREMENT=3276801 DEFAULT CHARSET=utf8mb4;

select count(*) from test_index where is_haveindex=1
时间: 0.501s
select count(*) from test_index where is_haveindex=0
时间: 0.631s

select count(*) from test_index where is_noindex=1
时间: 1.451s
select count(*) from test_index where is_noindex=0
时间: 1.511s

结论

自己看吧……