1、select seq_name.nextval from dual; //假设得到结果5656
2、alter sequence seq_name increment by -5655; //注意是-(n-1)
3、select seq_name.nextval from dual;//再查一遍，走一下,重置为1了
4、alter sequence seq_name increment by 1;//还原
原文：http://www.cnblogs.com/younes/p/3924434.html