切身体验MySQL的索引对搜索性能的提升

亲身体验mysql的索引对搜索性能的提升 1,创建一个user表，包含两列name,phone 2,用python（你喜欢的任何语言）插入100w条记录（lz的笔记本比较老，大概用了1分钟吧）： #!/usr/bin/env python# -*- coding:utf-8 -*-import mysqldbconn = mysqldb.connect(hos

亲身体验mysql的索引对搜索性能的提升

1,创建一个user表，包含两列name,phone

2,用python（你喜欢的任何语言）插入100w条记录（lz的笔记本比较老，大概用了1分钟吧）：

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import mysqldb

conn =  mysqldb.connect(host='localhost',user='root',db='millionmessage')
cur = conn.cursor()

for i in range(1,1000000):
    uname = "user" + str(i)
    uphone = "188000" + str(i)
    sql = "insert into user(name,phone) values('%s','%s')" % (uname,uphone)
    cur.execute(sql)

conn.commit()
cur.close()
conn.close()

3,在没建立索引的情况下搜索：

mysql> select * from user where name='user55555';
+-------+-----------+-------------+
| uid | name | phone |
+-------+-----------+-------------+
| 55567 | user55555 | 18800055555 |
+-------+-----------+-------------+
1 row in set (0.53 sec)

mysql> select phone from user where name='user55555';
+-------------+
| phone |
+-------------+
| 18800055555 |
+-------------+
1 row in set (0.46 sec)

4,对name属性建立索引：

mysql> alter table user add index index_username(name);
query ok, 0 rows affected (22.27 sec)
records: 0 duplicates: 0 warnings: 0

5, 查询：

mysql> select * from user where name='user55555';
+-------+-----------+-------------+
| uid | name | phone |
+-------+-----------+-------------+
| 55567 | user55555 | 18800055555 |
+-------+-----------+-------------+
1 row in set (0.00 sec)

mysql> select * from user where name='user999999';
+---------+------------+--------------+
| uid | name | phone |
+---------+------------+--------------+
| 1000011 | user999999 | 188000999999 |
+---------+------------+--------------+
1 row in set (0.00 sec)

结果秒出。可见在海量数据的数据库上，索引对搜索性能的提升是非常大的。

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