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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 of the users, to avoid the Create View error noted above.
Users will not be able to see if other users are running workflows as well, since that is private to user accounts.
Sharing work between different users can be accomplished as follows:
To share workflows, export them. Either email the XML document, or move it to a shared file server to allow users to import it 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 table space for all the data miner users. A single primary tablespace makes managing storage resources easier.