You can add or delete zones by using SQL statements or on OCP.
Add or delete zones by using SQL statements
You can add zones to a cluster to scale out the cluster or delete zones from a cluster to scale in the cluster.
The command for adding or deleting a zone is as follows, where the Zone_Name parameter specifies the name of the target zone:
ALTER SYSTEM {ADD|DELETE} ZONE Zone_Name;
Example 1: The following example statement adds Zone1 to the cluster.
obclient> ALTER SYSTEM ADD ZONE Zone1;
Example 2 : The following example statement deletes Zone1 from the zone.
obclient> ALTER SYSTEM DELETE ZONE Zone1;