Auto increment sequence problem

Question

Hi,
Is there any particular thing about 21st record because, when i insert data into same or different table, records start from 21 instead of 1 or where it was finished before.
Example : I leave a table with 3 records. Come back, I insert data into same table then, auto increment starts from 21 not the 4!!!
Thanks
CREATE SEQUENCE FRANC_AUTOINC_SEQ
START WITH 1
INCREMENT BY 1
NOMAXVALUE;
CREATE TRIGGER FRANC_AUTOINC_TRG
BEFORE INSERT ON FRANCHISE
FOR EACH ROW
BEGIN
SELECT FRANC_AUTOINC_SEQ.NEXTVAL INTO :NEW.FRANCHISEID FROM DUAL;
END;

Answer 1

Hi,
There's no need to do anything.
If you want fewer numbers to be discarded in the future, you can make the cache size smaller, or remove it entirely, as in:
CREATE SEQUENCE FRANC_AUTOINC_SEQ
START WITH 1
INCREMENT BY 1
NOMAXVALUE
NOCACHE;This may mean slightly less efficiency, since (to use my earlier analogy) you have to go to the number store and buy a new box every time you need a number, rather than going to the store once and not having to go back again until you've used up the box of twenty numbers. If you rarely use more than one new number in a session, the loss in efficiency will be insignificant.
Regardless of the caching, if only one session is using the sequence, you will get consecutive numbers in that session. If NOCACHE is in effect, and you are the only person using the sequence, you will get consecutive numbers even if work over multiple sessions.
Ending the session is what causes the cached numbrs to be discarded. Shutting down the database implies ending all sessions, but otherwise has nothing to do with the sequence.
Message was edited by:
Frank Kulash