Further reading :
Note that the only difference between loadbalancing value 1 and 0 is that when it is set to 0, the driver will pick up the next server in a sequential order instead of randomly (value 1).
Progress DataDirect Connect for ODBC Version 7.1.6
Attribute: LoadBalancing (LB)
Determines whether the driver uses client load balancing in its attempts to connect to the database servers (primary and alternate). You can specify one or multiple alternate servers by setting the Alternate Servers option.
Valid Values: 0 | 1
If set to 1 (Enabled), the driver uses client load balancing and attempts to connect to the database servers (primary and alternate servers) in random order.
If set to 0 (Disabled), the driver does not use client load balancing and connects to each server based on their sequential order (primary server first, then, alternate servers in the order they are specified).
Default: 0 (Disabled)
Configure an Oracle Policy Store
If the primary server is not accepting connections, specifies the connection failover to the other Oracle nodes. Example: (HostName=nete_servername2:PortNumber=1521:ServiceName=nete_servicename[,...])
Turns on client load balancing, which helps to distribute new connections to keep RAC nodes from being overwhelmed with connection requests. When enabled, the order in which primary and alternate database servers are accessed is random.