Error oracle- ORA-00019: maximum number of session licenses exceeded

ORA-00019: maximum number of session licenses exceeded

Cause:     All licenses are in use.

Action: Increase the value of the LICENSE MAX SESSIONS initialization parameter.

Error oracle- ORA-00018: maximum number of sessions exceeded

ORA-00018:  maximum number of sessions exceeded

Cause:     All session state objects are in use.

Action:     Increase the value of the SESSIONS initialization parameter.

Error oracle- ORA-00017: session requested to set trace event

ORA-00017:  session requested to set trace event

Cause:     The current session was requested to set a trace event by another session.

Action:     This is used internally; no action is required.