Autonumber in a Sequence after Export/Import

Question

Hi,
I have a sequence running in a DB, which increments an ID field. The problem comes up, when I need to backup/restore the DB. What I need then is a SQL script, which would allow me to set the MinValue to the max used value +1 (or + 100). Unfortunately something like
Create Sequence XXX.Mytable
Increment by 1
MinValue (SELECT MAX(COUNTERID) from XXX.Mytable);
MaxValue 1E+27
Cache 20;
does not work. So what is best practise to handle this case. I found many people posting this question, but no simple answer. Does anybody have one?
Thank you in advance
Pawel

Answer 1

Hi Pawel,
I would suggest creating a SQL Procedure and construct a string that would create the sequence and then use EXECUTE IMMEDIATE to create the sequence. Something like:
DECLARE
vMaxID NUMBER(10,0);
vSQL VARCHAR2(1000);
BEGIN
SELECT MAX(COUNTERID) INTO vMaxID FROM MyTable;
vSQL := "CREATE SEQUENCE COUNTERID_SEQ MINVALUE " || TO_CHAR(vMaxID) || " MAXVALUE 99999999999999999999999 INCREMENT BY 1 START WITH " || TO_CHAR(vMaxID) || " NOCACHE NOORDER NOCYCLE;
EXECUTE IMMEDIATE vSQL;
END;
Regards
Andy