Accessing Drupal database for read purposes
If you want easily importable data, consider using Views data export:


  This module is designed to provide a way to export large amounts of data from views. It provides a display plugin that can rendered progressively in a batch. Style plugins are included that support exporting in the following types:
  
  
  CSV
  Microsoft XLS
  Microsoft DOC
  Basic TXT
  XML
  


You can import CSV or XML to pretty much any data analysis tool you may need.