oracle error - ORA-00122: cannot initialize network configuration

ORA-00122:     cannot initialize network configuration

Cause:     ORACLE could not initialize SQL*Net version 2.

Action:     Check the error stack for detailed information.

oracle error - ORA-00121: SHARED_SERVERS specified without DISPATCHERS

ORA-00121:    SHARED_SERVERS specified without DISPATCHERS

Cause:    A definition for SHARED_SERVERS was specified in the initialization parameter file, but no definition for DISPATCHERS was specified. Without a value for DISPATCHERS, shared servers will never be used.

Action:    Add a definition for DISPATCHERS in the initialization parameter file (or remove the definition for SHARED_SERVERS, if shared servers are not being used).

oracle error - ORA-00120: dispatching mechanism not enabled or installed

ORA-00120:    dispatching mechanism not enabled or installed

Cause:    Either the dispatching mechanism was not enabled or the Oracle executable image was not installed with the dispatching mechanism.

Action:    Refer to the >Oracle9i Database Administrator's Guide and your operating system-specific documentation for procedures for starting and configuring the dispatcher process.