create

Create a new graph. The graph_name specified is used to create two DSE database keyspaces, graph_name and graph_name_system, and can only contain alphanumeric and underscore characters.

Create a simple new graph.

system.graph('FridgeItems').create()

The resulting list:

==>FridgeItems

is created with the NetworkTopologyStrategy class and replication factor based on the number of datacenter nodes, since no options were specified.

Create a simple new graph if it doesn't currently exist by modifying with ifNotExists().

system.graph('FridgeItems').ifNotExists().create()

The resulting list:

==>FridgeItems

An example that creates a graph on a cluster with two datacenters of 3 nodes:

system.graph('FridgeItems).
  replication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3, 'dc2' : 3 }").  
  systemReplication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3, 'dc2' : 3 }").
  ifNotExists().create();

The result:

==>null

shows that the graph was successfully created.

The replication settings can be verified using the cqlsh tool, running the CQL DESCRIBE KEYSPACE command:

DESCRIBE KEYSPACE "FridgeItems";

DESCRIBE KEYSPACE "FridgeItems_system";

with a result:

CREATE KEYSPACE "FridgeItems" WITH replication = {'class': 'NetworkTopologyStrategy', 'dc1: '3', 'dc2' : '3'} 
   AND durable_writes = true;
CREATE KEYSPACE "FridgeItems_system" WITH replication = {'class': 'NetworkTopologyStrategy', 'dc1: '3','dc2' : '3'}  
   AND durable_writes = true;