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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.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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