Question

I wanted to export 3 tables from db1 into db2.

Before the export starts, I will create the sequences for those 3 tables.

CREATE SEQUENCE TEST_SEQ START WITH 1 INCREMENT BY 1;

After the export, I will reinitialize sequnce values to match the max(id) + 1 from the table.

CREATE OR REPLACE PROCEDURE "TEST_SEQUENCE"
AUTHID CURRENT_USER
is
v_num number;
begin
select max(ID)  into v_num from TABLE_1;
EXECUTE IMMEDIATE 'ALTER SEQUENCE TEST_SEQ  INCREMENT BY ' || v_num;
EXECUTE IMMEDIATE 'ALTER SEQUENCE 1TEST_SEQ  INCREMENT BY 1'; 
end;
/
show errors;
execute TEST_SEQ;

This procedure compiles and executes without problems.

But when I want to check t he last value of the sequence, like
select TEST_SEQ.nextval from dual;

I still get the “1”.

Can someone tell me why my procedure did not impact my sequence?
ps. I am using oracle sql developper to pass sql.

Thanks

Answer 1

You need to actually make the sequence increment between the two alter statements:

EXECUTE IMMEDIATE 'ALTER SEQUENCE TEST_SEQ  INCREMENT BY ' || v_num;
select test_seq.nextval into v_num from dual;
EXECUTE IMMEDIATE 'ALTER SEQUENCE TEST_SEQ  INCREMENT BY 1'; 

In 11g you can assign the sequence directly:

v_num := test_seq.nextval;

Either way you don’t need to do anything with that value, you just need to generate it.

Alternatively you could create the sequences after the load, and set the starting value based on what you just loaded.