CDD-23572 connection to Oracle lost when deleting a column

Question

Hi
I use Designer 9.0.4.7, Oracle database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit.
When I add a column to a table or add a foreign key, it works well, but when I want to delete a column or a foreign key, I get the message 'CDD-23572 The connection to Oracle has been lost.'
Has anyone a idea what the reason could be that the connection is lost?
Regards,
Lida

Answer 1

First of all your 9.0.4.x Designer is not certified with a 10.2.0.4 DB.
The only version that is certifed is a 10.1.2.5
However here is the workaround:
Workaround is:
alter system set "_optimizer_cost_based_transformation"=off scope=both;
or create on logon trigger for designer users to alter the session, for
example:
create or replace trigger <des_user>.on_logon
after logon on database
begin
execute immediate 'alter session set
"_optimizer_cost_based_transformation"=off';
end;
Michael