Drew..

15

請注意,這并不是建議使用MyISAM一分鐘.我只是用它來得到我的id,min,max和count來排隊.所以請忽略引擎.

create table ratings

( id int auto_increment primary key,

thing int null

)engine=MyISAM;

insert ratings (thing) values (null),(null),(null),(null),(null),(null),(null),(null),(null);

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

insert ratings (thing) select thing from ratings;

我現在有4.7M行

select count(*),min(id),max(id) from ratings;

+----------+---------+---------+

| count(*) | min(id) | max(id) |

+----------+---------+---------+

| 4718592 | 1 | 4718592 |

+----------+---------+---------+

select * from `ratings` order by id limit 499500, 500;

-- 1 second on a dumpy laptop

.

explain select * from `ratings` order by id limit 499500, 500;

+----+-------------+---------+------+---------------+------+---------+------+---------+----------------+

| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |

+----+-------------+---------+------+---------------+------+---------+------+---------+----------------+

| 1 | SIMPLE | ratings | ALL | NULL | NULL | NULL | NULL | 4718592 | Using filesort |

+----+-------------+---------+------+---------------+------+---------+------+---------+----------------+

.

explain select * from `ratings` where id>=499501 limit 500;

+----+-------------+---------+-------+---------------+---------+---------+------+---------+-----------------------+

| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |

+----+-------------+---------+-------+---------------+---------+---------+------+---------+-----------------------+

| 1 | SIMPLE | ratings | range | PRIMARY | PRIMARY | 4 | NULL | 4198581 | Using index condition |

+----+-------------+---------+-------+---------------+---------+---------+------+---------+-----------------------+

故事的道德可能是使用where子句.

人們不能排除陷入僵局的可能性.

總結

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