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The Oracle by Example tutorial Setting Up Oracle Data Miner 11g Release 2 describes how to install the Data Miner Repository and grants rights to an account. This OBE is available at http://www.oracle.com/webfolder/technetwork/tutorials/obe/db/11g/r2/prod/bidw/datamining/ODM11gR2-SetUp.htm
If you have dropped a Repository or if you do not want to use the OBE, you can reinstall the repository as described in Install Repository Steps.
The Data Miner Repository resides in the database that the Data Miner client connects to. The repository stores metadata about workflows.
These steps are described in the tutorial:
Create a Data Miner User Account using SQL Developer
Create a SQL Developer Connection for the Data Miner User
Install the Data Miner Repository
By default Sample Data is installed. You can deselect loading these tables and views.
You can Drop the Data Miner Repository Using the GUI if necessary.
When you install the repository, rights are automatically granted to the user account that you connect with.
To grant rights to another account, define a database connection for the account and open the account in the Data Miner navigator. The GUI tells you that the account does not have the correct grants; click OK for the grants to be created. You must log in using an administrative (SYS) account.