Database link using problem

Hi all,
I have created database link using following code.
CREATE DATABASE LINK mydb
CONNECT TO system IDENTIFIED BY o
USING 'mydb'
After created this database link, I tried to access the table 'emp' from 'mydb' database. so, I was given
select * from emp@mydb; But its howing me an error message as 'ORA-12154: TNS:could not resolve service name'.
But when I try to connect mydb,its connecting properly.
then,why its showing this error message when I given select * from emp@mydb;
Kindly provide me the solution.
Thanks & Regards,
Lakshmi.P.

To be TNSNAMES.ora independent you would better create the DB link as
create database link mydb
connect to your_db_user
identified by "your_passwd"
using '(description=(address=(protocol=tcp)(host=your_host)(Port = your_port) )(connect_data=(sid=your_sid)))'
/change all the your_* parameters accordingly to your environment.
Note: Never use the sys- or system account for any application development ;)

Similar Messages

Database Link. Problem in Forms. Baffled!

Hoping someone can help.
I'm working on a system that has a form on it with a problem. Although there is a currently compiled and working version of this form available, I cannot get it to compile.
The situation is this.
There are 2 databases, MINX a 9i database, and PROD an APPS 11i database.
On the database PROD exists a view called MTL_ITEM_CATEGORIES_V.
SELECT is granted on this to the APPSINQ user.
On the database MINX exists a public synonym MTL_ITEM_CATEGORIES_V, which points at the view MTL_ITEM_CATEGORIES_V on the PROD database by way of a public database link, also called PROD. The database link uses the APPSINQ user on the PROD database.
(once the set_org_context, and nls_language have been set)
From SQL on the MINX database, I can select from the public synonym, MTL_ITEM_CATEGORIES_V, and rows are successfully returned from the MTL_ITEM_CATEGORIES_V view on the PROD database. This is all ok and good.
However, in the main form, is a trigger which does a select from the public synonym and this will not compile.
I get the error : identifier 'CATEGORY_SET_ID' must be declared.
It's like it can't see the category_set_id column in the view. However, if I create a new block, and base it on the public synonym, the category_set_id column is there for me to choose. Meaning that forms CAN see the column.
Am baffled! Anyone ??

Hi
I´ve got some problems with synonyms and dblinks in forms too. Try creating a local view based on the remote view usign the dblink (do not use the public synonym) and try to compile again.
I think in some cases the compiler gets lost trying to follow synonyms and links. a forms bug maybe?

Sintax error depending database link used

Hi every one, I have a weird weird situation and I need some tips to deal with it.
A code like that:
declare
all variables;
begin
select xxxx
into vl_xxx
from t1@db_L1 a
, t2@db_L1 b
, t3@db_L1 c
where etc;
some stuff;
end;
WHY this kind of code could faisl with sintax errors: dbe_jobs_pkg.pr_eje_alm:26-04-2010 09:22 --> ast_codigo = 47:ORA-06550: line 69, column 14:
PL/SQL: ORA-00904: "A"."TABLESPACE_NAME": invalid identifier)
depending of the database link used. Indeed, if I execute de query in a isolated way (sql*plus for example) it works fine using the database link whose plsql fail
I garantee there is not grants problems...
By the way, the code begun to fails suddendly, and I don't know what happened....
All the databases are 9.2.0.5
I need sugestions to track o investigate the posible causes
Thanks a lot, kind regards
Mauricio Fernández C.
ADDENDUM:
I've restarted the source database and the PL/SQl with sintax error now works fine....Still I need some tips to understand what's going on.....
Edited by: maufer on 26-abr-2010 7:10

Prashanth
my guess is that you can create the database link, which simply points to the remote instance. however, the problem is on the remote instance.
As the error message suggest, make sure that the listener is up and running on the remote machine. The link can be created, but if there is no listener on the other side, you will not get any response.

ERROR WHILE CREATING A DATABASE LINK USING HETEROGENEOUS SERVICES

I'm creating a database link with the Oracle Dataware Builder, and i get the following error:
Probando...
Fallo.
SQL Exception
Error del repositorio: Excepción SQL.
Nombre de la Clase: CacheMediator.
Nombre del Método: getDDEntryFromDB.
Mensaje de Error del Repositorio: ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[Generic Connectivity Using ODBC][Informix][Informix ODBC Driver][Informix]Incorrect password or user [email protected] is not known on the database server. (SQL State: 28000; SQL Code: -951)
ORA-02063: preceding 2 lines from PRUEBA_SEH
As you can see i'm using heterogeneus services to connect to a informix database. ALTIADM is a valid user for that database, i don't send my ip address 192.168.0.62, but the error says "[email protected] is not known in the database server". how can i solve it?????

Right places to ask this question are
Heterogeneous Connectivity
Warehouse Builder

Not able to create a database link using the database gateway of oracle 11g

HI,
While trying to create a database link to SQL server from Oracle ,using the database gateway provided with 11g, i am getting the following error while making use of it in selecting columns from tables :
Error starting at line 1 in command:
select * from test1@dblink
Error at Command Line:1 Column:20
Error report:
SQL Error: ORA-28513: internal error in heterogeneous remote agent
ORA-02063: preceding line from DBLINK
These are the steps i have followed for setting up:
1.Ran the set up for the Database gateway.and mentioned the SQL server name and database .ALos set up a listener.
2. Added the following in the Listener.ora of Oraclehome 11/NETWORK/ADMIN:
LISTENER_SQL_FCD =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =localhost) (PORT = 1541)
SID_LIST_LISTENER_SQL_FCD =
(SID_LIST =
(SID_DESC =
(SID_NAME=dg4msql)
(ORACLE_HOME= D:\app\20537\product\11.1.0\db_3)
(PROGRAM=dg4msql)
3.Added the following in tnsnames.ora inOracle home/NETWORK/ADMIN:
dg4msql=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1541))
(CONNECT_DATA=(SID=dg4msql))
(HS=OK)
4. Following is the entry in initdg4msql.ora in C:\product\11.1.0\tg_5\dg4msql\admin:
HS_FDS_CONNECT_INFO=10.148.45.242:1433//SalesDemo
HS_FDS_TRACE_LEVEL=DEBUG
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
5. Created the database link :
create database link dblink
connect to "sa" identified by "<pswd>"
using 'dg4msql'
On running :select * from test1@dblink i get the following error:
Error starting at line 1 in command:
select * from test1@dblink
Error at Command Line:1 Column:20
Error report:
SQL Error: ORA-28513: internal error in heterogeneous remote agent
ORA-02063: preceding line from DBLINK
Is there any issue with the set or definition that I get the above error?

What is the version of the Oracle database in which you have specified/and use the database link?
If it is for example 10.2.0.3.0 you need to apply the mandatory patch for RDBMS bug 5965763 first before being able to use an 11g gateway. Have a look at MetaLink note 457808.1 for details about this patch.
Regards,
Ed

Database link creation problem

localhost environment:
OS:windows 2000 server
Database:oracle 8.5
database name:orcl
remotehost environment:
OS:windows 2000 server
Database:oracle 8.5
database name:orac
These two servers in network and in the same workgroup like peer to peer.There is no concept of domain here.
Here in this environment i am getting the response from both of the servers at the time of using tnsping.
C:\>tnsping orac
TNS Ping Utility for 32-bit Windows: Version 8.1.5.0.0 - Production on 15-APR-06 21:30:54
(c) Copyright 1997 Oracle Corporation. All rights reserved.
Attempting to contact (ADDRESS=(PROTOCOL=TCP)(HOST=azad)(PORT=1521))
OK (70 msec)
C:\>tnsping orcl
TNS Ping Utility for 32-bit Windows: Version 8.1.5.0.0 - Production on 15-APR-06 21:31:02
(c) Copyright 1997 Oracle Corporation. All rights reserved.
Attempting to contact (ADDRESS=(PROTOCOL=TCP)(HOST=pvs)(PORT=1521))
OK (70 msec)
But at the time of creating database links in between these databases at local host i am getting this error message when i am using connect_user method:
SQL> create database link REMOTE_CONNECT connect to current_user using 'ORAC';
Database link created.
SQL> select * from emp@REMOTE_CONNECT;
select * from emp@REMOTE_CONNECT
ERROR at line 1:
ORA-00600: internal error code, arguments: [kspgsp2], [64978272], [265], [ent_domain_name], [0],
[1], [], []
But at the time of creating database links in between these databases at local host i am getting this error message when i am using identified method:
SQL> create database link REMOTE_CONNECT2 connect to scott identified by tiger using 'ORAC';
Database link created.
SQL> select * from emp@REMOTE_CONNECT2;
select * from emp@REMOTE_CONNECT2
ERROR at line 1:
ORA-02085: database link REMOTE_CONNECT2 connects to ORACLE
help me to create the database link in between these two databases..........

Hi, I have read carefully your letter.
Firt of all, when you use 'current_user' statement you must guarantee that such users have in both databases.If users exist in both databases and the error will appear again than try create database link with the option 'PUBLIC' as follow:
CREATE PUBLIC DATABASE LINK REMOTE_CONNECT connect to scott identified by tiger using 'ORAC';
and check the creation:
SQL> COL OWNER FORMAT a10
SQL> COL USERNAME FORMAT A8 HEADING "USER"
SQL> COL DB_LINK FORMAT A30
SQL> COL HOST FORMAT A7 HEADING "SERVICE"
SQL> SELECT * FROM DBA_DB_LINKS;
OWNER DB_LINK USER SERVICE CREATED
PUBLIC REMOTE_CONNECT.US.ORACLE.COM SCOTT ORAC 17.04.06
if the error appear again than checks parameter 'open_links' for your database instance. Default is 4. Increase that number. Good luck.Let me know if something go wrong.

Error using database link

Before creating the link, I went into my init.ora file and made sure the GLOBAL_NAMES entry was false.
I then created a database link using the following:
create public database link cindy_link
connect to system identified by syspswd
using 'PRECISEI';
My link was created, but when I attempt to use it, I get the error:
ORA-02085:database link CINDY_LINK.WORLD connects to PRECISEI.WORLD
Here is the entry from my tnsnames.ora file:
PRECISEI =
(DESCRIPTION =
(ADDRESS_LINK =
(ADDRESS =(PROTOCOL = TCP)(HOST = taurus)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = precisei.world)
Here is the entry from my listener.ora file:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = precisei.world)
(ORACLE_HOME = E:|oracle\ora81)
(SID_NAME = precisei)
(I must admit to not having a full understanding of SID_NAME vs SERVICE_NAME.) I looked in dba_db_links, and my db_link is named CINDY_LINK.WORLD instead of CINDY_LINK.
Do I have a problem in one of my files?
I would really appreciate any help.
Thanks.

Well, I was facing the same problem but corrected it later on. Let me describe the solution is little detail.
You need to check few things before creating db link.
1) db_name and db_domain in init.ora file
2) global_name in listener.ora file
3) service name in tnsnames.ora file.
It seems to me that you have not specified the db_domain in init.ora file. And in that case, you need to follow these steps.
I am considering here that you have database A on server X and database B on server Y.
Go to the first server (server X).
set the global name in init.ora file by following
Global_name=true
db_domain=usa.com
Start and open the database.
connect as system user.
(if your oracle sid is orcl then)
svrmgr30>alter database rename global_name
to orcl.usa.com;
this will set the global_name as specified in init.ora file. Here, your SID is orcl and db_domain is usa.com so global_name will be orcl.usa.com.
svrmgr30>Select * from global_name;
You get the answer like this.
Orcl.usa.com
Now, go to Listener.ora file and change global_name to the new name (orcl.usa.com)
restart the listener.
WE WILL SEE ABOUT THE CHANGES OF TNSNAMES.ORA LITTLE LATER.
Now, go to second server(server Y) and perform the same operation as defined above. i.e. Specify the db_name, db_domain in init.ora file, execute "alter database.." command for setting global_name and edit listener.ora file for new global name.
Once you do all these you need to create service on server 1 to connect to server 2 and on server2 to connect to server1.
Go to server X.
Open tnsnames.ora file and create an entry like this.
P =
(DESCRIPTION =
(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(Host = IP address of B)(Port= 1521)))
(CONNECT_DATA = (SID = P))
Here, P is global name of P ( at both the places).
Now, go to server Y.
Open tnsnames.ora file and create an entry like this.
Q =
(DESCRIPTION =
(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(Host = IP address of A)(Port= 1521)))
(CONNECT_DATA = (SID = Q))
Here, Q is global name of Q ( at both the places).
you are all set now.
Create database link between 2 servers now.
Say these are all your settings..
Server X is having database A with global_name orcl.usa.com and server Y is having database B with global_name orcl2.us.com
Now go to server X and create db link to server Y
Create public database link orcl2.us.com using 'orcl2.us.com'
(Note. don't miss to create a service 'orcl2.us.com' in server X's tnsnames.ora file)
And go to server Y and create db link there.
Create public database link orcl.usa.com using 'orcl.usa.com'
(Note. don't miss to create a service 'orcl.usa.com' in server Y's tnsnames.ora file)
hope this helps,
If this doesn't work, feel free to contact me.
Kalpen
<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by cindy spearman ([email protected]):
Before creating the link, I went into my init.ora file and made sure the GLOBAL_NAMES entry was false.
I then created a database link using the following:
create public database link cindy_link
connect to system identified by syspswd
using 'PRECISEI';
My link was created, but when I attempt to use it, I get the error:
ORA-02085:database link CINDY_LINK.WORLD connects to PRECISEI.WORLD
Here is the entry from my tnsnames.ora file:
PRECISEI =
(DESCRIPTION =
(ADDRESS_LINK =
(ADDRESS =(PROTOCOL = TCP)(HOST = taurus)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = precisei.world)
Here is the entry from my listener.ora file:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = precisei.world)
(ORACLE_HOME = E:|oracle\ora81)
(SID_NAME = precisei)
(I must admit to not having a full understanding of SID_NAME vs SERVICE_NAME.) I looked in dba_db_links, and my db_link is named CINDY_LINK.WORLD instead of CINDY_LINK.
Do I have a problem in one of my files?
I would really appreciate any help.
Thanks.<HR></BLOCKQUOTE>
null

Problem connecting DataBase Link from windows oracle to oracle on Linux

I'm facing a problem with database links from windows oracle to Oracle hosted on Linux server.
I'm able to successfully create the Database Link using the following query on oracle database hosted on a windows server
CREATE DATABASE LINK SampleDB
CONNECT TO myuser IDENTIFIED BY password
USING 'sample';
The tns names entry on windows for database in Linux server is as follows
DSOFT =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.100)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = sample)
But while executing the query "select count(*) from doctor@SampleDB;" in sql developer on windows, I'm getting the following error
SQL Error: ORA-12154: TNS:could not resolve the connect identifier specified
12154. 00000 - "TNS:could not resolve the connect identifier specified"
*Cause: A connection to a database or other service was requested using
a connect identifier, and the connect identifier specified could not
be resolved into a connect descriptor using one of the naming methods
configured. For example, if the type of connect identifier used was a
net service name then the net service name could not be found in a
naming method repository, or the repository could not be
located or reached.
Using the above tns entries, i'm successfully able to connect to the database in Linux server through sql developer installed on the windows machine. Then why i'm getting this error while executing the query on Database Link?. Can any one help me?

1005745 wrote:
I'm facing a problem with database links from windows oracle to Oracle hosted on Linux server.
I'm able to successfully create the Database Link using the following query on oracle database hosted on a windows server
CREATE DATABASE LINK SampleDB
CONNECT TO myuser IDENTIFIED BY password
USING 'sample';
The tns names entry on windows for database in Linux server is as follows
DSOFT =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.100)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = sample)
But while executing the query "select count(*) from doctor@SampleDB;" in sql developer on windows, I'm getting the following error
SQL Error: ORA-12154: TNS:could not resolve the connect identifier specified
12154. 00000 - "TNS:could not resolve the connect identifier specified"
*Cause: A connection to a database or other service was requested using
a connect identifier, and the connect identifier specified could not
be resolved into a connect descriptor using one of the naming methods
configured. For example, if the type of connect identifier used was a
net service name then the net service name could not be found in a
naming method repository, or the repository could not be
located or reached.
Using the above tns entries, i'm successfully able to connect to the database in Linux server through sql developer installed on the windows machine. Then why i'm getting this error while executing the query on Database Link?. Can any one help me?A database link is acting as a client to the target, remote database in exactly the same fashion and using exactly the same tns infrastructure as any other client trying to connect to that remote database. your ORA-12154 when querying a db link means exactly the same as if you had gotten it trying to connect with sqlplus, from the same server. Check the link SB provided. Keep in mind that the tnsnames file of concern is the one on the source database server.

Using Database link to go from one database to another

Hi all,
I am trying to create a SQL-query which connects to two
different databases.
I have created a Database link, which points from on database to
the other, and have supplied the database name, username and
password.
when I try to run following query I get error ORA:02085, MY_LINK
is connecting to SIEBN1S.(domain).com
SELECT COUNT(*) FROM MY_TABLE@MYLINK;
additional info:
2 databases are exact copies on different servers (SIEBN1S and
N1SSIEB)
the MY_TABLE exists in both databases and I have rights on it in
both, I can separately connect to both databases and look into
MY_TABLE
I have created the database link using following statement (in
the N1SSIEB db):
create database link MYLINK connect to <usr> identified by <pwd>
using 'SIEBN1S'
any help is welcome

You have set GLOBAL_NAMES to TRUE in your init.ora file. This
means your database link must have the same name as the database
you want to connect to ie SIEBN1S.(domain).com.
alternatively you can change GLOBAL_NAMES. to test this try
'ALTER SESSION SET GLOBAL_NAMES=FALSE'.
hth, APC

ORA-01017 error while using a database link

Hi all,
I have a TNS entry as below
HOME=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=10.66.205.110)(PORT=1521))
(CONNECT_DATA=(SID=HOME))
I have created a database link as
create public database link link92.com using 'HOME'.
This was created successfully and an entry was made in all_db_links table.
However if i try connecting to a table in the remote database...for example
select * from emp@link92;
I am receiving an error ORA-01017(Invalid username passwd).
Would appreciate if somebody could help me out.
Thank you

It is not that the Database Link is "PUBLIC" that makes it use the current username/password.
It is that the Database Link has been created without specifying a " CONNECT TO username IDENTIFIED BY password " that makes the DBLink behave as a "current user database link" using the current username/password to connect to the remote database.
You can have a PUBLIC database link that uses a "CONNECT TO username IDENTIFIED BY password" such that all connections use the same remote username and password.
You can also have "private" (ie not PUBLIC) database link that does not specify a "CONNECT TO username IDENTIFIED BY password" which becomes a "current user [owner] database link".

Database Link to MSSQL using JDBC

Hi, i'm trying to create a database link from Oracle on Solaris to a MSSQL database. We don't have ODBC installed on the server so i'm hoping to use JDBC to connect. Is that possible? Can someone tell me the format to use for the connection string. Thanks...

It is not possible to create a database link using JDBC.
You could load the SQL Server Type 4 JDBC driver into the Oracle JVM and then write a Java stored procedure that accesses the remote database if you would like. But Heterogeneous Services with Generic Connectivity, which allows you to create database links to non-Oracle databases, only supports ODBC and OLE DB.
Justin

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.

ORA-01017: invalid username/password; logon denied - Database Link

Hi Guys,
Could you help me, I have a problem connecting to another database using the database link:
*1. I added in tnsnanes.ora of "client" database DEV2*
DEV =
+(DESCRIPTION =+
+(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.100.85)(PORT = 1521))+
+(CONNECT_DATA =+
+(SID = DEVDB)+
+)+
+)+
*2. I tested my connection using tnsping*
oracle@dev> tnsping dev
TNS Ping Utility for Linux: Version 10.2.0.1.0 - Production on 10-JUL-2010 14:35:35
Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
+/opt/oracle/product/10.2/db_1/network/admin/sqlnet.ora+
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.100.85)(PORT = 1521)) (CONNECT_DATA = (SID = DEVDB)))
OK (0 msec)
oracle@dev>
*3. In SQLPLUS of DEV2 I connect to my database using the tnsnames entry*
SQL> conn devuser/pwd001@dev
Connected.
*4. I then create a database link.*
SQL> Create Database Link dev_Link
+2 Connect to devuser+
+3 identified by pwd001+
+4 using 'DEV';+
Database link created.
SQL>
*5. When I try to connect to the database using the database link I get an error, but I am very sure the username ans password are ok.*
SQL> select * from global_name@dev_link;
select * from global_name@dev_link
*+
ERROR at line 1:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from DEV_LINK
SQL>
What could be wrong......??

4. I then create a database link.
SQL> Create Database Link dev_Link
2 Connect to devuser
3 identified by pwd001
4 using 'DEV';create DATABASE LINK USING <connect-string>
your sid is DEVDB so create dblink using oracle_sid
If you specify only the database name, then Oracle Database implicitly appends the database domain to the connect string to create a complete service name. Therefore, if the database domain of the remote database is different from that of the current database, then you must specify the complete service name.
Edited by: rajeysh on Jul 10, 2010 7:28 PM

Unable to access table even after creating Database link

Hi
I have created a data base link.It was created properly.
The Syantax that I have used is follows:
create database link X_link connect to User1 identified by User1 using 'Other_Database'
And on running the query:
select count(*) from table1@X_link
I am getting the error as follows:
TNS could not resolve the connect identifier specified... TNS: could not resolve the connect identifier specified.
Please tell me where is the problem?
Thanks in Advance

Your database link does not work because the entry you used does not exist in the tnsnames.ora in the database $ORACLE_HOME.
Login to the database server, set the environment, and try to tnsping the entry you used for the database link, then fix the tnsnames.ora file (probably in $ORACLE_HOME/network/admin)
You can test a database link using :-
select sysdate from dual@link;

Error Creating Database link

Hello Everybody,
I am getting the following error while creating the database link using the connection information at OWB Client.
Testing...
Failed.
ORA-12514 TNS: no listener
*Cause: The connection request could not be completed because the listener is not running
*Action: Ensure that the supplied destination address matches one of the addressed used by the listener
-compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file
Start the listener on the remote machine.
The version of OWB Client is 10.1.0.2.0.
When queried at oracle using the userid which i used to login OWB Client i.e. as shown below
select db_link from all_db_links - the database link is created. But none of the obects are accessable with the db link.
Note: I am able to create a database link explicity by issuing the command at backend oracle i.e create database link etc. and also able to access the tables.
Kindly help.
Thanks
Prashanth

Prashanth
my guess is that you can create the database link, which simply points to the remote instance. however, the problem is on the remote instance.
As the error message suggest, make sure that the listener is up and running on the remote machine. The link can be created, but if there is no listener on the other side, you will not get any response.

Database link using problem

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