Note: XCONLY: The following description applies only to Postgres-XC.
CREATE NODE GROUP is new SQL query specific to Postgres-XC since 0.9.7 that creates node group information in catalog pgxc_group.
CREATE NODE only runs on the local node where it is launched.
The name of the selected cluster node group.
The name of a cluster node.
A group of nodes works as an alias for node lists when defining tables on sub-clusters. Only Datanode can be included in node groups.
Create a cluster node group made of nodes called Datanode1, Datanode2.
CREATE NODE GROUP cluster_group WITH Datanode1, Datanode2;
CREATE NODE GROUP does not conform to the SQL standards, it is a Postgres-XC specific command.