Is it possible for an installation on Citrix to have a global tnsnames.ora in the default location or pointed to by TNS_ADMIN, not modifiable by a user?
It is possible to do but there is no reason why the user could not edit the tnsnames.ora file, since you need read and write access to this especially with Citrix.
If the user is concerned about the tnsnames.ora being secured, then the suggestion would be that the user needs to set up an LDAP server.
Advice should be given to the user that he/she should double check with Oracle on these questions since the tnsnames.ora is part of their client.
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