oracle error - ORA-00123: idle public server terminating

ORA-00123:      idle public server terminating

Cause:     Too many idle servers were waiting on the common queue.

Action:     This error is used internally, no action is required.

oracle error - ORA-00124: DISPATCHERS specified without MAX_SHARED_SERVERS

ORA-00124:    DISPATCHERS specified without MAX_SHARED_SERVERS

Cause:    A definition for DISPATCHERS was specified in the initialization parameter file, but MAX_SHARED_SERVERS was specified as zero.

Action:    Specify MAX_SHARED_SERVERS to be greater than zero.

oracle error - ORA-00125: connection refused; invalid presentation

ORA-00125:      connection refused; invalid presentation

Cause:     The PRESENTATION in the CONNECT_DATA of the TNS address DESCRIPTION is not correct or is not supported.

Action:     Correct the PRESENTATION specified in the TNS address.