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If each user is a different data miner user, you avoid any conflicts when users want to name their own objects. There is also complete privacy because each user account is under Oracle Database Security. This would require you to grant access (READ ONLY) directly to each user.
Users are not able to see if other users are running workflows as well; this information is private to user accounts.
You can share work among different users as follows:
To share workflows, export them by right clicking the name of the workflow and selecting Export Workflow. Either email the resulting XML document, or move it to a shared file server. Users then import the workflow into their own account.
The importing process prompts the user to optionally rename objects to avoid conflict in the new account.
Tables, views, models created in one account can be granted to users in other accounts.These objects can then be referenced for use either by an imported workflow or new workflows. For more information, see Granting Access.
It may be possible to create a single primary tablespace for all the data miner users. A single primary tablespace makes managing storage resources easier.