Altering Views in Oracle 10.2

Question

Hi,
I have a requirement that we need to change code of some views before running some daily batches (part of the code is not required for running the daily batches) and then revert back to the original code once the daily batches finish. Instead of using alter view command daily, I though about creating a new view for the modified code which will be used for running the batches and just swap the names of the two views before running the daily batches and then revert back after batches completion.
Any suggestion on this?
Thanks,
Younis

Answer 1

Instead of modifying the view, why not have 2 different Views and a Synonym for the "correct" view. The Application Code references only the synonym and you have "pre-Batch" and "post-Batch" commands to drop and recreate the Synonym to point to the "correct" view. That way, no objects get invalidated !
SQL> create table TAB_A as
  2  select 'HEMANT' as owner, object_name, object_type, created
  3  from user_objects;
Table created.
SQL> create table TAB_B as
  2  select owner, object_name, object_type, created
  3  from dba_objects;
Table created.
SQL> create view UNIONALL_VIEW as select * from TAB_A union all select * from TAB_B;
View created.
SQL> create view UNION_VIEW  as select * from TAB_A union select * from TAB_B;
View created.
SQL> select count(*) from UNIONALL_VIEW;
  COUNT(*)
     46290
SQL> select count(*) from
  2  UNION_VIEW;
  COUNT(*)
     45927
SQL>
SQL> create synonym my_view for UNIONALL_VIEW ;
Synonym created.
SQL> select count(*) from my_view;
  COUNT(*)
     46290
SQL> drop synonym my_view;
Synonym dropped.
SQL>
SQL> select object_name from user_objects where status = 'INVALID';
OBJECT_NAME
list shows other objects that we are not interested in
SQL>
SQL>  create synonym my_view for UNION_VIEW;
Synonym created.
SQL> select object_name from user_objects where status = 'INVALID';
OBJECT_NAME
list shows other objects that we are not interested in
SQL>
SQL> select count(*) from my_view;
  COUNT(*)
     45927
SQL>Hemant K Chitale