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.

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Problem with database links (naming) Windows/Linux

Hi
Windows xp SP3_
SQL*Plus: Release 11.2.0.1.0 Production on Wed Nov 21 10:28:21 2012
Connected to:
Oracle Database 11g Release 11.2.0.1.0 - Production
name is PORCL30
Linux (Ubuntu 12.04 LTS)_
SQL*Plus: Release 11.2.0.1.0 Production on Wed Nov 21 10:28:21 2012
Connected to:
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Name is GWORCL
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Tnsnames.ora
PORCL30 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP) (HOST = home1.I-Surname.co.uk) (PORT = 1521) )
(CONNECT_DATA =
(SERVER = DEDICATED)
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(SERVICE_NAME = PORCL30.I-Surname.co.uk)
GWORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP) (HOST = freds-server.I-Surname.co.uk) (PORT = 1521) )
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = GWORCL)
(SERVICE_NAME = GWORCL.I-Surname.co.uk)
From Windows to Linux
DROP DATABASE LINK "GWLINK4";
CREATE DATABASE LINK "GWLINK4"
CONNECT TO "SYSTEM" IDENTIFIED BY VALUES '051BDCE........D55BB704DA'
USING 'GWORCL';
results in a working database link named 'GWLINK4.I-Surname.co.uk'
Where as
Linux to Windows
DROP DATABASE LINK "PLINK4";
CREATE DATABASE LINK "PLINK4"
CONNECT TO "SYSTEM" IDENTIFIED BY VALUES '0550AA0F39......AE5EF62220FE5A323'
USING 'PORCL30';
name is PLINK4 as determined by
select DB_LINK from user_db_links;
So what is different between the two databases other than the operating systems they run on? What should I examine?
I should add that the linux PC is Internet facing and has a Public IP address (USB mobile broadband Modem) to which I-Surname.co.uk resolves via (ZoneEdit.com and ddclient). The ethernet lan port 10.10.1.35 connects to a switch where 10.10.1.30 (home1) is also connected (10.10.1.10 is the AD server)
Thanks for your time
Edited by: Neill_R on Nov 21, 2012 1:09 PM

The problem is that the databases do not work in the same way. As I have said one produces DBLINK.i-surname.co.uk and the other DBLINK. Both machines are members of the i-surname.co.uk domain.
In Sqldeveloper one can not alter the DBLINK since it has a "-" character (.I-Surname.co.uk)
Why the difference?
connect system@TNSGWORCL
CREATE DATABASE LINK PLINK
CONNECT TO SYSTEM IDENTIFIED BY
USING 'TNSPORCL30';
Connect system@tnsporcl30
CREATE DATABASE LINK GWLINK
CONNECT TO SYSTEM IDENTIFIED BY
USING 'TNSGWORCL';
connect system@tnsgworcl
Enter password:
Connected.
select 1||' - '||db_link from sys.user_db_links
union
select 2||' - '||db_link from sys.user_db_links@PLINK
DB_LINK
1 - PLINK
2 - GWLINK.I-SURNAME.CO.UK
SQL> connect system@tnsporcl30
Enter password:
Connected.
select 1||' - '||db_link from sys.user_db_links
union
select 2||' - '||db_link from sys.user_db_links@GWLINK
DB_LINK
1 - GWLINK.I-SURNAME.CO.UK
2 - PLINK
Tnsnames.ora
# tnsnames.ora Network Configuration File: /opt/oracle/11g/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
TNSGWORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = freds-server.i-surname.co.uk)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = GWORCL)
(SERVICE_NAME = GWORCL.i-surname.co.uk)
TNSPORCL30 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = home1.i-surname.co.uk)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = PORCL30)
(SERVICE_NAME = PORCL30.i-surname.co.uk)
)

Problem with using database link from oracle 7 to oracle 9i

Hi To Every One
I have two oracle database oracle 7.3.4.0.1 and oracle 9i 9.2.0.1.0.
and the tns alias to connect to oracle 9i database is oracle9i and tns
alias to oracle 7 database is oracle7.I have no problem in connect to
these database using these tns aliases from either database.The tns
alias for oracle 7 is available in tnsnames.ora file of oracle9i and
tns alias for oracle 9i is available in tnsnames.ora file of oracle 7.
So there is no connection problem from each other.Connection is
working fine for each other but the problem with database links is
like this
Problem:
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IDENTIFIED BY <PASSWORD> USING 'ORACLE7';
OR
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I RECEIVE A ORACLE ERROR LIKE
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OR IF MY COMMAND IS LIKE
SQL ORACLE9I> SELECT <FEILD_NAME> FROM
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I RECEIVE AN ORACLE ERROR LIKE
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BUT IF I CREATE A LINK FROM ORACLE7 USER FOR ORACLE9I USER
IT WORKS FINE.
PLZ HELP ME WHAT IS THE PROBLEM THAT THE LINK FOR ORACLE 7 IS NOT WORKING WHEN
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Thank u.

Oracle 9.2.0 does not support connectivity to Oracle 7. The newest version that will support this is 9.0.1.

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Hi
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Interactive report performance problem over database link - Oracle Gateway

Hello all;
This is regarding a thread Interactive report performance problem over database link that was posted by Samo.
The issue that I am facing is when I use Oracle function like (apex_item.check_box) the query slow down by 45 seconds.
query like this: (due to sensitivity issue, I can not disclose real table name)
SELECT apex_item.checkbox(1,b.col3)
, a.col1
, a.col2
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, table_two b
WHERE a.col3 = 12345
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AND b.col5 = a.col5
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I would like to get ideas from people how to resolve or speed-up the query?
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Looking at your case I would be interested to see what the explain plan and results would be for something like the following two statements (sorry - you're going have to check them, it's late!)
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(SELECT /*+ MATERIALIZE */ *
FROM table_one),
b AS
(SELECT /*+ MATERIALIZE */ *
FROM table_two),
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(SELECT b.col3 x
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WHERE a.col3 = 12345
AND   a.col4 = 100
AND   b.col5 = a.col5)
SELECT apex_item.checkbox(1,x), y , z
FROM sourceqry
WITH a AS
(SELECT /*+ MATERIALIZE */ *
FROM table_one),
b AS
(SELECT /*+ MATERIALIZE */ *
FROM table_two)
SELECT apex_item.checkbox(1,x), y , z
FROM table_one a
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WHERE a.col3 = 12345
AND   a.col4 = 100
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We aren't being told the real cardinality of the inners select here so the explain plan is distorted (this is normal for queries on remote and especially non-oracle sites). This hinders tuning normally but I don't think this is your problem at all. How many distinct values do you normally get of the column aliased 'x' and how many rows are normally returned in total? Also how are you testing response times, in APEX, SQL Developer, Toad SQLplus etc?
Sorry for all the questions but it helps to answer the question, if I can.
Cheers
Ben
http://www.munkyben.wordpress.com
Don't forget to mark replies helpful or correct ;)

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How to create database link from oracle to sql server

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Please help with how to create database link from oracle to sql server
Best regards,
Vishal
Hi Vishal,
I found a lof of information regarding how to create a database link from Oracle to SQL Server, please see:
https://www.google.co.in/?gws_rd=cr&ei=vd3XUvGFO8TgkAXqlYCADg#q=how+to+create+database+link+from+oracle+to+sql+server
We discuss SQL Server related issue in this forum. If you have any more question regarding Oracle, please post it in Oracle communities forum for better support.
Regards,
Elvis Long
TechNet Community Support

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Hi,
I am trying to create a database link from an oracle 8i database to connect to an oracle 9i database ... When testing the connection , I always receive an error "The Database link is not active"
Notes
1- Creating a database link that connects from the same 8i database to another 8i database succeeds. This gave me the impression that it is a compatibility problem but I am not sure.
2- I changed the initialization parameter
global_names = falseand restarted the Oracle database
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thanks

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CT =
(DESCRIPTION =
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Krzysztof Szymaniak wrote:
Thanks for all replies.
Below is server's tnsnames.ora
CT =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = krzysztof)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
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(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)
SQL Error: ORA-12154: TNS:could not resolve the connect identifier specified
12154. 00000 - "TNS:could not resolve the connect identifier specifie
Rgds
Krzysztof
PS. I tried with using 'XE' - not working.Assuming that is the correct tnsnames, of course XE is not working. You don't have a tnsnames entry for 'XE'.
You need to be aware that when using a dblink, the client is the db in which the link is defined, not the desktop from which you connect to that database.
I think you need to start here:
http://edstevensdba.wordpress.com/2011/02/26/ora-12154tns-03505/
http://edstevensdba.wordpress.com/2011/02/09/sqlnet_overview/ (Help! I can’t connect to my database )
http://edstevensdba.wordpress.com/2011/02/16/sqlnet_client_cfg/ (Help! I can’t connect to my database (part duex) )
The fact that your client (db link) is a database doesn't change anything taught in the above.

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umar

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ERROR at line 1:
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Note;
=====
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PARAMETER VALUE
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
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NLS_SORT BINARY
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NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
{color:#ff0000}NLS_CHARACTERSET AL32UTF8{color}
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
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NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
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I create database link from XE to 8i - it works fine:
I create view in XE based on table from 8i
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ORA-12705: ORA-12705: invalid or unknown NLS parameter value specified
ORA-02063: preceding line from LINKED8i
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Hi,
i don't have a solution for your problem but i want to share with you my research in using Database Links with XE/Apex.
I have done it a in a lot of projects and in most of all cases it shows a strange behavior when using Database Links via Apex. As far as i know SQL-Request in Apex are executed via the DBMS_SQL-Package. And that seems to be source for all errors and strange behaviors you get.
If you post a SQL-Request directly from your XE, everything's fine. If you do the same from APEX, sometimes it is very slow and sometimes it fails.
So, my approach to this issue is to work with Materialized Views. Your can create MV's on your XE to reference your remote tables and even schedule refreshes. In Apex, you only work with these MV's instead of the remote tables. And everything's going to be fine!
Hope this helps!
Regards, Jens

Problem connecting DataBase Link from windows oracle to oracle on Linux

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