ORA-40341: Access violation on model storage object in Oracle?
Database tables created using ore.push will have the prefix ORE$. Normally, these are automatically cleaned up when the R session ends or the ORE db connection terminated (unless you save the ore.frame objects in an ORE datastore). 

In-database models from Oracle Data Mining (ODM)  as created from ore.odmSVM will also normally be deleted automatically and the end of the R session or ORE db connection termination. You should not attempt to remove DM$ tables as they are part of the in-database model. If you do delete any of these, their corresponding models will be corrupted/invalid. 

You can invoke 

SELECT name FROM dm_user_models;


to see the list of models in the database for your schema. 

You can drop ODM models using the following in SQL*Plus or SQL Dev:

BEGIN 
  DBMS_DATA_MINING.DROP_MODEL('MY_MODEL'); 
END;


Lots of thanks goes to Mark Hornick, Senior Manager, Oracle Advanced Analytics for his constant support in ORE implementation in my project.