Common Oracle Error ORA-12560
Owh, ORA-12560: TNS:protocol adapter error..
This is the error that always I faced and always forgot what is this error about.
This error was like dejavu all over again. I ever faced and solved this but, how eh? Every time this error comes, I’m start looking and navigate to tnsnames.ora, sqlnet.ora and other .ora files. Haha 
The error appear whenever I want to sqlplus / as sysdba:
C:\Users\fareast>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.3.0 - Production on Sun Jan 17 00:29:50 2010
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
Ok, now the work around.
How many database on this machine? 1 or more than 1? ok, thats the cause of ORA-12560: TNS:protocol adapter error.
Solution1 :
C:\Users\fareast>sqlplus system/password@orcl_is_my_db
SQL*Plus: Release 10.2.0.3.0 - Production on Sun Jan 17 00:40:50 2010
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
but for Solution 1, I need to add "orcl_is_my_db" SQL*Net configuration string inside the tnsnames.ora
Solution2:
C:\Users\fareast>set ORACLE_SID=orcl
C:\Users\fareast>sqlplus / as sysdba
SQL*Plus: Release 10.2.0.3.0 - Production on Sun Jan 17 00:45:40 2010
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
Just set the ORACLE_SID to environment and we’re done.
for Windows : set ORACLE_SID=orcl
for Unix: export ORACLE_SID=orcl
Ok, thats all my notes for today..:)
plz hellp me
i have a problem
when i m start forms through form builder
error msg ora-2560 TNS problem
have any soulation to solve it.
Hi Raj, is your db in the same machine?if no, refer solution 1 above, if yes refer solution 2 and check your ORACLE_HOME path and ORACLE_SID.
-my 20 cents-
i got this in my tnsnames.ora
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = gzr-hacktop)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)
how do i login as sysdba?
Easy man..
sqlplus sys/yoursyspassword@XE as sysdba