Your database is not configured for session failover. Your tnsnames.ora file contains the following details:  test.us.oracle.com= (DESCRIPTION=  (ADDRESS_LIST= (LOAD_BALANCE=off)   (FAILOVER=ON)   (ADDRESS= (PROTOCOL=tcp)(HOST=test1-server)(PORT=1521))   (ADDRESS= (PROTOCOL=tcp)(HOST=test2-server)(PORT=1521)))   (CONNECT_DATA= (SERVICE_NAME=test.us.oracle.com)))   Which feature is enabled in this case?()
A:Load balancing
B:Instance failover
C:Database failover
D:Connect-time failover
E:Transparent Application Failover (TAF)
出自:Oracle认证