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Status Future consideration
Workspace Db2
Created by Guest
Created on Mar 29, 2022

Automated Re-creation of Select-Star Views

If a view is created by using a 'SELECT *' statement, the view is not updated when a new column is added to the base table. An example:


create table dm_tab(N integer, M integer) organize by row;

insert into dm_tab(N, M) values (1, 2);

create view dm_vw1 as select * from dm_tab;

commit;

alter table dm_tab add column K integer default 3;

commit;


-- The new column K is not part of the view:

select * from dm_vw1;

N M

- -

1 2

This means that we need to re-create our views if an underlying table has changed. Because we have more than 30,000 views along with table alterations on a regular basis in our software release life cycle, we ask you to introduce a feature to automate the re-creation of the affected views.

The feature could be implemented in DB2 via an additional procedure similar to the ADMIN_REVALIDATE_DB_OBJECTS procedure. Alternatively it could be embedded in SQL via a 1st level construct of the language like for example a new optional clause in the CREATE VIEW statement.

Please notice that the feature which we are asking for would correspond to the standard behavior of Oracle databases.

Needed By Quarter