Configuring Transparent Application failover

Hotspot 1	This parameter indicates that you are going to use TAF. If you leave out this parameter, or set the TYPE sub-parameter to NONE, no failoversare handled.
Hotspot 2	Name the database service that picks up the failed transaction.
Hotspot 3	Specify which type of failover you wish to handle. The choices are: SESSION (a user session failure is reconnected on the backup.); SELECT (a user's cached query continues to deliver data after instance failure); and NONE (no failovers allowed).
Hotspot 4	Specify the method used for failover. The chouces are: BASIC (creates a connection on the backup only when a failure occurs.); PRECONNECT (creates a connection on the backup during normal sessions so failover - if needed - is faster.)