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You can use the sys.segments table where you can see segment per segement, datasource per datasources some usefull info

Pro tip: If you use the web console, go to the datasources page and click the

...

button. There is an option where it will open the query view with the sql query it used to generate the view for the datasource view. This is a good starting point if you want to tweak the query to show something different from the sys.segments table