Cannot Connect to Two 11g DBs - Same tnsnames.ora different Oracle_Home

We have two 11g databases on seperate Oracle Homes on the same server. The tnsnames.ora and listener.ora entries for db_2 were combined with those of db_1 in ...../db_1/network/admin. They are:
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/db_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
DB1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST=10.200.18.28)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = DB1)
#DB2 =
# (DESCRIPTION =
# (ADDRESS = (PROTOCOL = TCP)(HOST=10.200.18.28)(PORT = 1521))
# (CONNECT_DATA =
# (SERVER = DEDICATED)
# (SERVICE_NAME = DB2)
# listener.ora Network Configuration File: /u01/app/oracle/product/11.1.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST =10.200.18.28)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = DB1)
(ORACLE_HOME = /u01/app/oracle/product/11.1.0/DB1)
#SID_LIST_LISTENER =
# (SID_LIST =
# (SID_DESC =
# (SID_NAME =DB2)
# (ORACLE_HOME = /u01/app/oracle/product/11.1.0/DB2)
DB2 is commented out because we coulod not reach either database when it was not. Now we can each one or the other. We were getting
"ora_12514 TNS:listener could not resolve seervice name given in connect description."
The problem is that we need to reach each database when connected to the server from eithere the client or server.
I would appreciate any information, direct experience or pointers to documents.
Thanks

You shouldn't need either DB1 or DB2 listed in your listener.ora file. They should automatically register with the listener if it is running on the default port (which yours is).
If you do want to statically register the instances, the syntax you have in your original post is a little wrong. It should be:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(ORACLE_HOME = /u01/app/oracle/product/11.1.0/db_1)
(SID_NAME = DB1)
(SID_DESC =
(ORACLE_HOME = /u01/app/oracle/product/11.1.0/db_2)
(SID_NAME = DB2)
All in one variable, not two. Also, the home paths you had in your post were missing the _.
All that said, it seems to be much preferred to let the instance register itself. If you try the following, does the instance register?
* remove the SID_LIST_LISTENER configuration for DB1
* restart the listener
* connect to DB1 as someone with the DBA role and execute 'alter system register;'
* check the listener with 'lsnrctl status listener' and see whether the instance registered.
You should see something like: (notice 'READY' instead of 'UNKNOWN')
Instance "DB1", status READY, has 1 handler(s) for this service...

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(PRESENTATION = RO)
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(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
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(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\11.2.0\server)
(PROGRAM = extproc)
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(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.80.194)(PORT = 1521))
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Service "PLSExtProc" has 1 instance(s).
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CONNECT system/[email protected]
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Hi ...
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LISTENER =
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LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
Can you connect now.....????
Regards,
Simon

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For some reason, now (before & after installing 7.0.1) it says 'Cannot connect to Music Store' (the same error message as when the firewall is enabled - but its NOT)
NIS generates new rules for every new version of itunes, so you can run into this sort of thing when you upgrade itunes.
which version of Norton Internet Security is she using? 2005, 2006 or an earlier version?

Cannot Connect to Two 11g DBs - Same tnsnames.ora different Oracle_Home

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