In oracle database how do we maintain same surrogate key (sequence value) on both tables simultaneously

Question

In our data warehouse, we have a requirement to load 2 tables which are at the same grain. Volume in both tables is exactly same. During the insert, i need to load same surrogate key (sequence) simultaneously. Are there any ways to achieve this?

Answer 1

There are too many unknowns about your ETL process, so I apologize if this is way off. It's too long for a comment though.

You can insert into multiple tables at the same time using the INSERT ALL command. Like this:

create sequence matt_s;
create table etl1 ( id number, other_data VARCHAR2(30));
create table etl2 ( id number, other_data VARCHAR2(30));

insert all 
  into etl1 (id, other_data) values ( matt_s.nextval, other_data )
  into etl2 (id, other_data) values ( matt_s.nextval, other_data )
select /* dummy source data */ 
       to_char(rownum) other_data
from   dual src
connect by rownum <= 50;

Every row in the source query will be inserted into both tables and share common values for the id column.