Database Link not Active

I am trying to create a database link from Oracle 7.3.4 to Oracle 8i. When I click the "Test" button in OEM ( after entering the relevant data) I am getting an error that reads "Database Link not Active". What am I doing wrong? can someone help?

Hi ,
Thanks again for your quick and extremely helpful response.
As you have guessed this is my clients tnsname.ora file. From your response i believe i need to check the tnsnames.ora file of the database itself ( i assume it resides in the server box).
I used the same exact systax for creating the link and the link was successfully created. But i was not able to access any table and was getting the error "TNS: could not resolve service name." Now i understand that the 7.3 server is not able to connect to the 8i, as it does not know of its existence (as there is no information available in its own tnsnames.ora file). Am i right?
Thank you once more.
You will make my day (assuming i understood you right.)

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We have a notification process (on disabled user) in OIM that needs to connect to a schema in another instance to check some information before the notification is sent out.
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USING 'databasename';
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Database link not working

Hi,
I created a database link and i added a tns entry also. But when i try to connect to a database using db link it throws me an error
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Oralce 10g version on Windows 2003 NT.
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All,
Platform : Linux
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Sorry. My error and situation seemed so close to this unsolved issue from a year ago, that I didn't copy and paste the details initially. Here goes:
oracle@linux99 ~]$ sqlplus
SQL*Plus: Release 11.2.0.3.0 Production on Mon Aug 12 22:56:33 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter user-name: test_dblink_20130812
Enter password:
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Database link dropped.
SQL> CREATE DATABASE LINK "TEST_NOW.MDBT.XXX.COM"
CONNECT TO APP_UHYDRAST_RW
IDENTIFIED BY XXXXXXXX
USING 'mdbt'; 2    3    4
Database link created.
SQL> select * from dual@TEST_NOW.MDBT.XXX.COM;
select * from dual@TEST_NOW.MDBT.XXX.COM
ERROR at line 1:
ORA-01034: ORACLE not available
ORA-02063: preceding line from TEST_NOW.MDBT.XXX.COM
Process ID: 6638
Session ID: 544 Serial number: 1753
In listener.ora, we have this (some other DB's are in lower case):
(SID_DESC =
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      (ORACLE_HOME = /ora5/app/oracle/product/11.2.0)
      (GLOBAL_DBNAME = MDBT)
and, in tnsnames.ora we have this:
LISTENER_MDBT =
(ADDRESS = (PROTOCOL = TCP)(HOST = linux99.XXX.com)(PORT = 1522))
MDBT =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = tcp)(HOST = linux99)(PORT = 1522))
    (CONNECT_DATA =
      (SERVICE_NAME = mdbt.XXX.com)
      (SERVICE_NAME = mdbt)
      (SID = MDBT)

Create database link not working..

sir,
i have created a database link using the following statement.
create database link orcl.vishnu.com;
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ora-02019 connect description for remote database not found..
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when i use the following statement it works..
create database link link1 connect to vishnu identified by password using 'orcl.vishnu.com';
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create database link link1 connect to current_user using orcl.vishnu.com...
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hi,
You have must first read through the documentation and understand things, then you will understand the difference and you will not get the Issues.
http://www.psoug.org/reference/db_link.html
http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/b10759/statements_5005.htm
Wish you Happy New Year 2010...!!
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Oracle 9i/10g - OCP
http://oracleinternals.blogspot.com/

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Hello,
Oracle Version : 9.2.0.1
O/S : Win XP SP2
Sir
I have to dbs (orcl and reccat) I want to create a database link from reccat to orcl. I have performed following steps and getting error in fetching query through database link.
SQL> Create database link foo connect to current_user using 'ORCL';
Database link created.
SQL> select * from scott.emp@foo;
select * from scott.emp@foo
*+
ERROR at line 1:
ORA-28030: Server encountered problems accessing LDAP directory service
My Tnsnames.ora is as :
TNSNAMES.ORA
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
INST1_HTTP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = MODOSE)
(PRESENTATION = http://HRService)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
STANDBY =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = standby)
RECCAT =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = reccat)
RECCAT_LAPTOP =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
(CONNECT_DATA =
(SID = reccat)
(SERVER = DEDICATED)
Listener.ora
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = g:\oracle\ora92)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = orcl)
(ORACLE_HOME = g:\oracle\ora92)
(SID_NAME = orcl)
(SID_DESC =
(GLOBAL_DBNAME = standby)
(ORACLE_HOME = g:\oracle\ora92)
(SID_NAME = standby)
(SID_DESC =
(GLOBAL_DBNAME = reccat)
(ORACLE_HOME = f:\rec_cat)
(SID_NAME = reccat)
STANDBY =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = laptop)(PORT = 1521))
Pl. guide me where is the problem and how to rectify it.
Regards
Neeraj

Which portion of the documentation is that quote from ?
See this "+CURRENT_USER database links connect as a global user. A local user can connect as a global user in the context of a stored procedure--without storing the global user's password in a link definition.+ " at the 9.2 documentation that was provided to you earlier in this thread
http://download-uk.oracle.com/docs/cd/A97630_01/server.920/a96521/users.htm#17355
and "+CURRENT_USER database links connect as a global user. A local user can connect as a global user in the context of a stored procedure, that is, without storing the global user password in a link definition+." in the 10.2 documentation
http://68.142.116.70/docs/cd/B19306_01/network.102/b14266/admnauth.htm#i1006269
and the CURRENT_USER clause and the "Defining a CURRENT_USER Database Link" Example of the CREATE DATABASE LINK documentation in 10.2
http://68.142.116.70/docs/cd/B19306_01/server.102/b14200/statements_5005.htm#i2061505
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http://hemantoracledba.blogspot.com

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Database link works for OS user "oracle" but not for other clients

My DBA connects as user1 to db1 and successfully queries over database link db2.
[oracle@linux19 ODA]$ sqlplus user1/****@db1
SQL*Plus: Release 11.2.0.3.0 Production on Fri Apr 12 07:39:49 2013
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Connected to:
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D
XI log in from a Windows XP client and test the same database link with a ORA-12154 result.
C:\>sqlplus user1/****@db1
SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 12 11:18:18 2013
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Connected to:
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SQL> SELECT * FROM DUAL@db2;
SELECT * FROM [email protected]
ERROR at line 1:
ORA-12154: TNS:could not resolve the connect identifier specifiedI can create and successfully use database links by including the full TNS entry in the USING string.
What are some possible causes for the different results?
What additional information might I supply to help troubleshoot?
Thanks very much.
- Doug
Edited by: enquad on Apr 12, 2013 2:56 PM
changed "database link db1" to "database link db2" per comments by SB
Edited by: enquad on Apr 12, 2013 3:00 PM
Changed "user" to "OS user" in subject for clarity

enquad wrote:
Sorry gentlemen and SB, but my question is still not answered. It is a new question, which I have not found answered elsewhere.
To summarize:
SB97025 informs me that db1 is not a database link, but I never said that it was. It is the second database (anonymized as "db2") that is connected to through the database link "db2.mycompany.net".
SB97025 also wonders intriguingly if my DBA and I are we really connecting to the same database when we each connect to user1 on db1. Perhaps the Oracle server and my PC have TNSNAMES.ORA files that lead us to different databases for the same TNS alias? I do not believe this is the case, because my DBA created that user1 and that database link in the db1 database specifically for the purpose of doing this test and I see that same link when I connect to user1 on db1. Unless my DBA is spoofing me by creating user1 in two different databases - only one of which contains a working dblink named db2.mycompany.net - just for the purpose of throwing me off, I would have to conclude that he and I are actually connecting to the same database.There is no reason to "believe" (or not) that "this is the case". The entire point of SB's comment on that was to get you to verify. President Reagan famously said "trust but verify". He never worked as a DBA. I say "don't trust, just verify".
Obviously something is different. And at this point the most likely and easiest to confirm is that you and your DBA really are connecting to the same database, on the same host server, using the same link. And at this point all we really have is to trust your DBAs statement.
>
Ed Stevens reminds me that db1 is acting as a client to db2 and so the solutions to the ORA-12154 are the same as for any client connection as listed on his blog (which I had already read), none of which solve my problem. Rembember, the DBA can use the database link, so by whatever means the TNS lookup is happening when he uses it, the correct connection description is being found. The question is not "why does this stinkin' database link not work"? It does work for the DBA.
Pierre wants to make sure I know that it is the Oracle server's TNSNAMES file that is the important thing, not my client's TNSNAMES file, which is true but not relevant to my problem and I was never so naive. He also says that I could try creating a database link by including the full TNS entry in the USING string, which does work as I had already mentioned in my original post.
Amar asks if my DBA can: sqlplus username/password@db2.
The answer is yes. The dba can use SQL*Plus to connect to db2 from the server hosting db1 and can connect to db1 from the server hosting db2. There is almost nothing my DBA cannot do.
None of the posters addressed the key information in my post, which was the different result my DBA and I get when using the same database link in the same schema on the same database. That AND the fact that my DBA is logged on to Linux Oracle serve as user "oracle" and I am logged in to my PC. Why should it matter to a database link which computer is running SQL*Plus or who the OS user is?
Also the GLOBAL_NAMES parameter is set to FALSE.
- Doug

Creating a database link to another schema in the same database

Hello,
I'm trying to create a database link to another schema in the same database. It was created without errors, but when I try to use it I receive "ORA-12154: TNS:could not resolve the connect identifier specified" message...
I'm trying to do it because on my production enviroment the databases are separated, so there I can use database links without problem, but in my development environment it's all in one database separated by schemas...
So I'm trying to simulate the same system to not need to rewrite the query every time I move from development to production environment.
Any ideas?
Thanks

Hi,
Yes, you can create a database link to your own database. I've done it before for exactly the same reason you want to.
(By the way, I think it's a good reason. What are the alternatives?
Having different versions of code for Development and Production? Absolutely not! Terrible idea!
Using synonyms or substitution variables that are set differently in the different databases? That might be more efficient than a database link, but efficiency probably isn't such a big issue in Development.
[Conditional compilation|http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28370/fundamentals.htm#sthref250]? This might be good; it has all the efficienty of the above options, with more clarity.)
Assuming you do want to stick with a database link, not all errors are caught when you create the link.
Is the Development database in the tnsnames.ora file of the Development server? Do you have other database links, either in the Development server or pointing to it, that work? What is different about the ones that work, and the one that doesn't?
Edited by: Frank Kulash on Oct 14, 2009 1:58 PM
The more I think about this, the more I agree with the earlier respondent: synonymns are a good solution for this.
To that suggestion you replied:
On this way I might use "select * from SCHEMA.table" instead of "select * from table@SCHEMA"... I looking for an option to use the second way...Actually, the suggestion was that you say:
select *
from SCHEMA_table_ptr;where schema_table_ptr is a synonym.
In Development, that synonym is defined as schema.table.
In Production, that synonym is defined as table@SCHEMA
Why are you "looking for an option to use the second way"?
If you think that people reading the code should realize that the query is being done via a database link (at least in Production), then add a comment.

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