changes in Materialized

Question

I have one Materialized view on one server which is created by DB link. There is one job running on that Mview. (created with dbms_refresh.make earlier).

Now I have created 3 new fields in original table. My queries are.

1) Do I need to drop and create Mview again, if yes, do i need to create Mview log on main server again 2) What happens to job running on Mview , do i need to create it agin?

Also there are views created on Mview ,so --If i run create or replace view query , will it create any problem?

Please guide.

Thanks!

Answer 1

If you need to include the new columns in your materialized view then yes you need to re-create the materialized view. You must explicitly drop the view as there is no "create or replace materialized view" statement.

DROP MATERIALIZED VIEW blah;
CREATE MATERIALIZED VIEW blah...

Dropping/recreating the materialized view should re-create the refresh job. Not 100% certain, but you should probably recreate the log as well.

And, if you don't need to include the new columns in your view, you really don't need to do anything...

Answer 2

After dropping/creating the materialized view, you should recompile the other views afterwards, because they may have become invalid.

You can check if that happened with

select * 
from user_objects
where status = 'INVALID';

Recompile a view can be done with

alter view the_view compile;

or

exec dbms_utility.compile_schema(user);

This simply recompiles everything in your schema. Be sure to have no running jobs while doing this!