Changing oracle DB link from Public to Private

Dear All,
I would like to know what will be the impact of chaning a PUBLIC db link to PRIVATE db link.
following is the scenario.
In our Prod distributed environment, there are many Databases which need to talk to each other for which we have create PUBLIC db links.
Similar PUBLIC DB links are also created in our DEV/ST/SIT/UAT environment...
Now we would like to know;
1. What will be impact (especially negative) if those DB link are converted to PRIVATE.
2. What are the disadvantages aer this PUBLIC to PRIVATE conversion...code espacially application users, code execution etc.
3. What are the considerations / steps to be taken to avoid any issues due to this PUBLIC to PRIVATE conversion.
Thanks and Regards
Santy.

What is he reason you want to do this?
1. What will be impact (especially negative) if those DB link are converted to PRIVATE. Public link is accessible to every user in the database and Private db link ca be used by only the owner of the db link. This could potentially break the workflow.
2. What are the disadvantages aer this PUBLIC to PRIVATE conversion...code espacially application users, code execution etc. Depends. Public are generally considered more unsecure. Only disadvantage I can see is that you have to fully study your environment before doing it. You have to check all the users who are using that public database link and create private one for all of them.
3. What are the considerations / steps to be taken to avoid any issues due to this PUBLIC to PRIVATE conversion.See 2

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