HS_FDS_CONNECT_INFO = op

# LISTENER.ORA Network Configuration File: \NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = pr)(PORT =  1521 ))
    )
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (PROGRAM = extproc)
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = c:\oracle_9i)
    )
#  добавленное
    (SID_DESC =
      (PROGRAM = hsodbc)
      (SID_NAME = op)
      (ORACLE_HOME = c:\oracle_9i)
# конец добавленного    
)
    (SID_DESC =
      (GLOBAL_DBNAME = OEMREP.net)
      (ORACLE_HOME = c:\oracle_9i)
      (SID_NAME = OEMREP)
    )
  )

LOGGING_LISTENER = OFF

# TNSNAMES.ORA Network Configuration File: \NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.

PR.NET =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = pr)(PORT =  1521 ))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = prinadl)
    )
  )
# вот это и добавил:
OP =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = pr)(PORT =  1521 ))
    )
    (CONNECT_DATA =
      (SID = OP)
    )
    (HS = OK)
  )
# конец добавлений

create public database link Fox using 'op';

select * From op@fox:

The test did not succeed.
ORA- 03113 : end-of-file on communication channel