转载：mysql-Auto_increment值修改

转载网址：http://libo93122.blog.163.com/blog/static/1221893820125282158745/

查看db.table表的下一条记录auto_increment的值：
show
table status from db like 'table';

如：
mysql>
show table status from mailbox like 'mailbox';         
+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
|
Name    | Engine | Version | Row_format | Rows | Avg_row_length | Data_length |
Max_data_length | Index_length | Data_free |Auto_increment|
Create_time         | Update_time         | Check_time          |
Collation         | Checksum | Create_options | Comment |
+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
|
mailbox | MyISAM |      10 | Dynamic    | 1681 |            148 |      249688 |
281474976710655 |       104448 |         0 |         15355|
2012-03-13 11:19:10 | 2012-03-13 11:19:10 | 2012-03-13 11:19:10 |
latin1_swedish_ci |     NULL |                |         |
+---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+---------------------+-------------------+----------+----------------+---------+
1
row in set (0.00 sec)

Auto_increment：15355
这个就是下一条记录会使用的自增ID；


修改db.table表下一条记录使用的自增ID值为20000：
alter
table db.table auto_increment=20000;

如：
mysql> alter table
mailbox.mailbox auto_increment=20000;          
Query OK, 1681 rows affected
(0.05 sec)

这时再进行show table
status from mailbox like 'mailbox'; 
auto_increment已经变成20000；
新插入的记录，自增字段就会从20000开始；