ORA-12514 & Listener Status Instance status Unknown issue

Question

Dear All,
Database Version - 10.2.0.5.0
Operating System - Windows XP
I am using Oracle 10g version, which has two services (bit10g and ora10g) installed on it.
Service ora10g was working before upgradation of Database to 10.2.0.5.0 and it was fine.
On upgradation I was unable to start and connect using ora10g so I created another that is bit10g.
Service bit10g was working fine for quite a long time. The last I worked and connected was on thu and it was connecting with no issues.
Now when I am trying to connect to database today I am unable to connect as I am getting
ORA12514 - TNS:listener does not currently know of service.
Secondly I tried to search forums which guided me to check the Listener Status.
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\Admin>lsnrctl status
LSNRCTL for 32-bit Windows: Version 10.2.0.5.0 - Production on 12-JAN-2013 11:42
:54
Copyright (c) 1991, 2010, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=toshiba-arif)(PORT=1521)
STATUS of the LISTENER
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 10.2.0.5.0 - Produ
ction
Start Date                12-JAN-2013 11:18:12
Uptime                    0 days 0 hr. 24 min. 43 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   C:\ora10g\product\10.2.0\db_1\network\admin\listener.o
ra
Listener Log File         C:\ora10g\product\10.2.0\db_1\network\log\listener.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=toshiba-arif)(PORT=1521)))
Services Summary...
Service "Oracle8" has 1 instance(s).
  Instance "bit10g", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfullyFollowing is my listener.ora file
# listener.ora Network Configuration File: C:\ora10g\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = Oracle8)
      (SID_NAME = bit10g)
LISTENER =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = toshiba-arif)(PORT = 1521))
  )Please note that I am a developer with no DBA exposure.
So please guide me so that I will be able to resolve my issue.
Thanks & Regards
Arif Khadas

Answer 1

Once again Thanks Paul for your quick response.
I also have Oracle 9i installed on my machine but the service and Listener for 9i is stopped.
Following is the tnsnames.ora for 9i
# TNSNAMES.ORA Network Configuration File: C:\oracle\ora92\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.
BIT10G =
(DESCRIPTION =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = toshiba-arif)
(PORT = 1521)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = bit10g)
BIT_ORA9I =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = IAS)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORA9I)
ORA10G =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = toshiba-arif)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ora10g)
ORA9I =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = toshiba-arif)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ora9i)
INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = AH-IBM)(PORT = 1521))
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = MODOSE)
(PRESENTATION = http://HRService)
CRCPROD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.1.1.185)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = bridges)
IAS_ORA10G =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = IAS)(PORT = 1522))
(CONNECT_DATA =
(SID = ORA10G)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
BIT_ORA10G =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = IAS)(PORT = 1522))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORA10G)
)