CREATE SEQUENCE SEQ_USER_NO START WITH 10001 INCREMENT BY 1 MAXVALUE 1E28 MINVALUE 1 NOCYCLE CACHE 20 NOORDER;
DROP SEQUENCE SEQ_USER_NO;
SELECT SEQUENCE_NAME,INCREMENT_BY,LAST_NUMBER FROM user_sequences WHERE sequence_name='SEQ_USER_NO';
ALTER SEQUENCE SEQ_USER_NO INCREMENT BY 1000;
SELECT SEQ_X.NEXTVAL FROM DUAL;
ALTER SEQUENCE SEQ_USER_NO INCREMENT BY 1;