Oracle Create Sequence

CREATE SEQUENCE customers_seq
START WITH     1000
INCREMENT BY   1
NOCACHE
NOCYCLE;

CREATE OR REPLACE TRIGGER JOB_INSTANCE_BRI
BEFORE INSERT ON JOB_INSTANCE
FOR EACH ROW
BEGIN
SELECT JOB_INSTANCE_SEQ.nextval INTO :new.JOBINSTANCEID FROM dual;
END;

DROP SEQUENCE HIBERNATE_SEQUENCE;
CREATE SEQUENCE "HIBERNATE_SEQUENCE" INCREMENT BY 1 START WITH 1000 CACHE 100 NOORDER NOCYCLE;
select HIBERNATE_SEQUENCE.nextval from dual
grant SELECT ON HIBERNATE_SEQUENCE to ROLE;