When multiple addresses exists for a net service name, you can configure the address:

Try each address, in order, until one succeeds:

Select this option to turn on the fail over feature for a release 8.1 client. If the first address cannot be reached, fail over, allows the client to use the next listener address. See Configuring Fail Over and Load Balancing.

Select this option and the Use Options Compatible with Net8 8.0 Clients option to turn source routing off for a release 8.0 or previous client. See the Net8 Administrator’s Guide for further information about Oracle Connection Manager and source routing.

Try each address, randomly, until one succeeds:

Select this option to turn on load balancing and fail over features for a release 8.1 client.

See Configuring Fail Over and Load Balancing.

Try one address, selected at random:

Select this option to turn on the load balancing feature for a release 8.1 client. Load balancing randomly chooses between listener addresses.

See Configuring Fail Over and Load Balancing.

Use each address in order until destination is reached:

Select this option to turn on source routing for either a release 8.1 or release 8.0 or previous client.

When this option is set, the first address is for the client connection to an Oracle Connection Manager, and the second address is for the Oracle Connection Manager connection to a listener. In other words, addresses are interpreted sequentially.

See the Net8 Administrator’s Guide for further information about this option and configuring Oracle Connection Manager.

Use only the first address:

Select this option to not set any source routing, fail over and load balancing features.

Use Options Compatible with Net8 8.0 Clients:

Select this option if you are configuring a pre-release 8.1 client. You will only be able to select the following options:

-Try each address, in order, until one succeeds

-Use each address in order until destination is reached

The load balancing and fail over options are release 8.1 features.

Clear this option if you are configuring for a release 8.1 client. You will be able to select any of the multiple address options.