oracle 手动增长序列值

一、select seq_name.nextval from dual; //假设获得结果5656 
二、alter sequence seq_name increment by -5655; //注意是-(n-1) 
三、select seq_name.nextval from dual;//再查一遍，走一下,重置为1了 
四、alter sequence seq_name increment by 1;//还原