declare
n number(10);
v_startnum number(10):=10000001;--从多少开始
v_step number(10):=1;--步进
tsql varchar2(200);
v_seqname varchar2(200):='MIP_JF_SEQUENCE';--序列名
begin
execute immediate 'select '||v_seqname||'.nextval from dual' into n;
n:=v_startnum-n-v_step;--从10000001开始
tsql:='alter sequence '||v_seqname||' increment by '|| n;
execute immediate tsql;
execute immediate 'select '||v_seqname||'.nextval from dual' into n;
tsql:='alter sequence '||v_seqname||' increment by '||v_step;
execute immediate tsql;
end;
Oracle重置序列(不删除重建方式)
Oracle中一般将自增sequence重置为初始1时，都是删除再重建，这种方式有很多弊端，依赖它的函数和存储过程将失效，需要重新编译。
不过还有种巧妙的方式，不用删除，利用步长参数，先查出sequence的nextval，记住，把递增改为负的这个值（反过来走），然后再改回来。
假设需要修改的序列名：seq_name
CREATE SEQUENCE seq_name
INCREMENT BY 1
START WITH 1
NOMAXvalue
NOCYCLE
CACHE 10;
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
可以写个存储过程，以下是完整的存储过程,然后调用传参即可:
create or replace procedure seq_reset(v_seqname varchar2) as n number(10);
tsql varchar2(100);
begin
execute immediate 'select '||v_seqname||'.nextval from dual' into n;
n:=-(n-1);
tsql:='alter sequence '||v_seqname||' increment by '|| n;
execute immediate tsql;
execute immediate 'select '||v_seqname||'.nextval from dual' into n;
tsql:='alter sequence '||v_seqname||' increment by 1';
execute immediate tsql;
end seq_reset;
################################################
CREATE SEQUENCE seq_name
INCREMENT BY 1
START WITH 1
NOMAXvalue
NOCYCLE
CACHE 10;
CREATE SEQUENCE seq_name2
INCREMENT BY 1
START WITH 1
NOMAXvalue
NOCYCLE
CACHE 10;
CREATE SEQUENCE seq_name3
INCREMENT BY 1
START WITH 1
NOMAXvalue
NOCYCLE
CACHE 10;
创建用于获取所有序列名，
select sequence_name from user_sequences;
select sequence_name from all_sequences where sequence_owner='SCOTT';