How can I drop a graph for which is not clear was it created explicitly or not? If you are not sure whether a given graph is created explicitly or not, in order to drop the graph use the DROP SILENT GRAPH statement: DROP SILENT GRAPH <http://example1.com> callret-0 Drop silent graph <http://example1.com> -- done If a given graph is created explicitly however, i.e. using the CREATE GRAPH statement: CREATE GRAPH <http://example2.com> callret-0 Create graph <http://example2.com> -- done then you can use DROP GRAPH in order to drop the graph: DROP GRAPH <http://example2.com> callret-0 Drop graph <http://example2.com> -- done Related What is the difference between "DELETE FROM GRAPH" and "CLEAR GRAPH"? How can I delete graphs using stored procedure? How can I drop a graph?