I am CONFUSED SEQUENCE CACHE BUG OR NOT

Question

I HAVE CONFUSED, I HAVE CREATE ONE SEQUENCE AND I HAVE TEST BELOW PRACTICAL OF SEQUENCE
STEP 1 --
CREATE SEQUENCE SEQ_TEST
START WITH 1
MAXVALUE 999999
CACHE 20 ;
STEP 2 --
CREATE TABLE TEST_SEQUENCE (NO NUMBER) ;
STEP-3 --
INSERT INTO TEST_SEQUENCE VALUES(SEQ_TEST.NEXTVAL);
STEP-4 --
SELECT * FROM TEST_SEQUENCE;
STEP --5
CREATE SEQUENCE SEQ_TEST
START WITH 1
MAXVALUE 999999
CACHE 20 ;
ORA-00955: NAME IS ALREADY USED BY AN EXISTING OBJECT
STEP-6 --
INSERT INTO TEST_SEQUENCE VALUES(SEQ_TEST.NEXTVAL);
STEP-7 --
SELECT * FROM TEST_SEQUENCE;
I AM NOT SURE, SO PLEASE SUGGESTION

Answer 1

Hi gunjan ,
I copied all your code and executed ,its working file there is nothing wrong .
But the problem is, as you are using cache ,some times it will skip 20 nos .
visit the beloiw link for further explanation
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:530735152441
Plz mark answered .
Regards
Timir