I think you can definitely set default service for server side load balancing without an issue. Are you facing issue while using default service?Did you check the number of session based on service_name from gv$session?
Hello. At the moment I couldn't even change this service's properties:
sql>select name, goal, clb_goal from dba_services where name='MYDB';
NAME GOAL CLB_G
---------- ----- -----
So, I try to change CLB_GOAL to 'short' I got an error:
$srvctl modify service -s MYDB -d MYDB -j SHORT
PRKO-2120 : The internal database service MYDB cannot be managed with srvctl
Or are there other ways to change this ?