mysql自增长为什么会每次加2的原因

show variables like '%increment%';

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

| Variable_name | Value |

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

| auto_increment_increment | 2 |

| auto_increment_offset | 1 |

| div_precision_increment | 4 |

| innodb_autoextend_increment | 8 |

| ndb_autoincrement_prefetch_sz | 32 |

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

5 rows in set (0.01 sec)

set auto_increment_increment = 1和set @@auto_increment_increment = 1

如果想永久性的改回为1,在my.cnf or my.ini中查找这个field,然后修改，然后restart mysql.