Best way to show multiple copies of same data to different users

Hi,
I am new to configuring and using Oracle. I have an oracle db installed on a server machine and I loaded it with a set of data. I have multiple users who would all like to access the tables but they need to see unique copies of the data.
What is my best approach? Should I create a new database instance? If so what is the best way to copy data to the new instance?
Any help is greatly appreciated.

Each developer should copy from the 'base' schema to his own the tables he requires to do his work. Give each developer select privileges on the 'base schema' tables so he cannot change them. This way, the developer can refresh his data as needed on his own. Public synonyms for the base schema tables will enable developers to only have to copy tables they wish to modify.
Creating a separate fully loaded schema for each developer is going to create a never ending load of work for you as developers will be constantly asking you to refresh their schemas. Alternatively, you could create an export of production on a schedule and let the developers do the import to their schema when they wish.
Basically, these folks are developers and, IMNSHO, should be managing their own development schemas.

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