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By default, a clustering node builds two models, one each using O-Cluster and k-Means.
If you are connected to Oracle Database 12c or later, a clustering node also builds an Expectation Maximization model, so that three models are built.
All clustering models in the node have the same input data and the same Case ID, if one is specified.
If you want to never build models using one of the algorithms by default, deselect that algorithm. A user will still be able to add models using the deselected algorithm to a clustering node.