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There are two tabs in the SQL Developer GUI that list database connections. The SQL Developer Connections navigator lists all database connections; the Data Miner navigator lists connections used for data mining.
Actions such as Install the Data Miner Repository Using the GUI can be performed only from the Data Miner navigator.
Data mining tasks, such as creating projects and workflows, must be done from a connection in the Data Miner navigator.
Ti create an appropriate connection for data mining, Create a User Account for Data Mining and then Add a Connection to the Data Miner Navigator.