Problem with database links (naming) Windows/Linux

Question

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:
Oracle Database 11g Release 11.2.0.1.0 - Production
Name is GWORCL
My domain is Initial-Surname.co.uk (I-Surname.co.uk)
Tnsnames.ora
PORCL30 =
(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)
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

Answer 1

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)
)