open_links, open_links_per_instance doesn't work

Hi,
I would like to limit number of connections through db link to one connection only.
I've set both parameters open_links and open_links_per_instance to 1.
But i can still run more than one queries in different sessions (also query inside pl/sql loop). What is wrong. I think that i can't understand these parameters meaning.
How can i limit number of connections through db links ? How these parameters work really what i don't know ? Very appreciate for any answer

open_links_per_instance allows other transaction owned by the same user to go thru the link, that's why you can run more than one query.
open_links limits the number of connection TO REMOTE databases; you do no set this parameter on the target database.

I assume you have created on the target database a specific-private account to be used by DBlink to connect; am I correct?

If yes, you can set a limit to how many concurrent sessions can have that specific account.

Hello Pavb,

Should i do sth like this :

CREATE PROFILE clerk LIMIT
SESSIONS_PER_USER 1

?

Best Regards Arkadiusz Masny

Yes. Then assign the Oracle account DBLink uses to connect to that profile.