Problem with TOAD

Hi all,
I've problems with usage of Toad by developers deploying and monitoring on a production environment, that causes performance problems.
In particular addm reported that there is a statement (select from GV$SESSION) frequently launched by Toad that impacts on DB performance (even if i suppose that this kind of statement does not have great cost in terms of resource usage).
How can i prevent, if possible, this kind of problem (suggesting some good rules to my colleagues or changing toad settings)?
How can i block access to the database through toad?
Thanks a lot for responses!!
P.S.: sorry for my english :-P
Jacorobo

In addition to blocking access via TOAD, or any other tool, you can limit the user's access to the catalog. One way to do this...
Create a new role something like APP_DEVELOPERS
grant select on prod tables to APP_DEVELOPERS
grant any subordinate roles necessary to APP_DEVELOPERS
grant create session to APP_DEVELOPERS
grant select on DBA_ tables you wish the developers to see.
DO NOT grant any privileges on V$ views (or underlying tables).
Grant this role to your developers.
Revoke all system privileges and other roles from your application developers.
Now you have restricted the activities of your application developers in production, regardless of the tool they use.

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UPDATED POST
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UPDATED POST-2
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Message was edited by:
user548995
Message was edited by:
user548995

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