Oracle Error Message
ORA-00019 – maximum number of session licenses exceeded
Reason for the Error
All licenses are in use. The session value’s upper limit was surpassed by the maximum number of licences.
Solution
There are few solutions to fix this problem
Check the license_max_sessions value using the below query
show parameter license_max_sessions
You can then Increase the value of the LICENSE MAX SESSIONS initialization parameter if you have more license for the session
ALTER SYSTEM SET license_max_sessions=10 scope=both;