Creating a graph in the Gremlin console

DataStax Studio creates a graph automatically for each connection that is created. In Gremlin console, a graph must be manually created. In addition to creating the graph, a graph traversal must be aliased to the graph in order to run queries.

  1. Start the Gremlin console.

  2. Create a simple graph with default settings to hold the data.

    gremlin> system.graph('food').create()
    $ ==>null

    This command is not available if a graph traversal is aliased with the :remote config alias g some_graph.g command. In order to access the system command, reset the alias with :remote config alias reset

  3. Create a graph with non-default replication, systemReplication, and configuration settings:

    system.graph('food2').
    
      replication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3 }").
      systemReplication("{'class' : 'NetworkTopologyStrategy', 'dc1' : 3 }").
      option("graph.schema_mode").set("Production").
      option("graph.allow_scan").set("false").
      option("graph.default_property_key_cardinality").set("multiple").
      option("graph.tx_groups.*.write_consistency").set("QUORUM").create()

    For graphs created in multi-datacenter clusters, the DSE database settings must use NetworkTopologyStrategy and a replication factor greater than one. If the graph is created with a replication setting of SimpleStrategy and a replication factor of 1, the graph data will be stored across the multiple datacenters rather than localizing the data in the graph datacenter.

    + The default replication strategy for a multi-datacenter graph is NetworkTopologyStrategy, whereas for a single datacenter, the replication strategy will default to SimpleStrategy. The number of nodes will determine the default replication factor:

    Nodes per datacenter and default replication factor
    number of nodes per datacenter graph_name replication factor

    graph_name_system replication factor

    1-3

    number of nodes per datacenter

    number of nodes per datacenter

    greater than 3

    3

  4. On the remote Gremlin Server, set the alias for the graph traversal g to the graph traversal specified in food. To run traversals, the graph traversal must be aliased to a graph.

    gremlin> :remote config alias g food.g
    $ ==>g=food.g
  5. A list of all graphs can be retrieved with the following command:

    gremlin> system.graphs()
    $ ==> food
    $ ==> test

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