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Home -> Community -> Mailing Lists -> Oracle-L -> RE: DB links
Yes, I saw you previous post and tried it. I have mucked about with this before
but I have multiple db's running on this server and one of them is our OMS. I didn't
want to make a change while playing with a test db that would affect production
stuff. I did try it briefly but it didn't fix my problem this time.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Juan Cachito Reyes
Pacheco
Sent: Friday, March 05, 2004 10:31 AM
To: oracle-l_at_freelists.org
Subject: Re: DB links
After we migrated to windows 2000 we have problems in db links, because
server suffix
so we fixed doing this
update global_name set global_name='SID';
and set sqlnet.ora
NAMES.DEFAULT_DOMAIN = WORLD
I want to append to this thread because I've been having many the same
problems this week and couldn't get my
answer out of this thread which I saved.
I copied my production database and moved it to another server.
I changed the global_name to xxxxx.standby using the ALTER DATABASE RENAME
GLOBAL_NAME TO xxxxx command.
I had an existing (copied) db link in this database copy.
It stopped working because the 'standby' appended to the db_link.
We restored the name on the copy by updating global_name. You can't change
it back by using rename. It wants
'something.something' and will not name it back to 'something.' And, no, I
don't recommend making any changes
to the data dictionary this way and wouldn't do it on a production system. I
tested the db link and it worked.
I dropped the db link again, changed the name of the database back to
xxxxx.standby and recreated the db_link and
got the error caused by the database name being different than the link name
plus
global name.
I altered session and set global_name to false;
My error changed to a "TNSNames cannot resolve service name"
I couldn't solve it. I created the db link again with the fully qualified host. That didn't work.
CREATE PUBLIC DATABASE LINK xxx
CONNECT TO xxxxxx IDENTIFIED BY xxxxxxx
USING 'xxxxxxxxx =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = xxxxxxxxxxxx)(PORT = 1521))
)
(CONNECT_DATA =
(SID =xxxxxxx)
(SERVER = DEDICATED)
)
)
';
I dropped it, recreated the link again back to the db link alias.
CREATE PUBLIC DATABASE LINK xxx
CONNECT TO xxxxxx IDENTIFIED BY xxxxxxx
USING 'xxxxxxxxx'
It worked.(??)
I think the key was that the link had to have been created after the 'alter
session set global_name to false'; I'm
not sure why the fully qualified host didn't work. I'm not positive what I
did to fix it. I've reconstructed it as best
I could. I thought this might be useful the next time somebody gets stuck.
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Ana Choto
Sent: Thursday, February 12, 2004 10:52 AM
To: oracle-l_at_freelists.org
Subject: Re: DB links
I'm not sure if you found a solution for this yet. But, one thing I had trouble with when using a link was that I was using the service name on my select statement instead of the name of the link's.
i.e., select from xxx_at_servicename instead of select from xxx_at_dblink_name
Thanks
Ana E. Choto
American University
e-Operations - Information Technology
Phone (202) 885-2275
Fax (202) 885-2224
Michael Milligan
<Michael.Milligan
@ingenix.com> To
Sent by: "'oracle-l_at_freelists.org'"
oracle-l-bounce_at_f <oracle-l_at_freelists.org>
reelists.org cc
Subject
02/11/2004 06:50 DB links
PM
Please respond to
oracle-l_at_freelist
s.org
Has anyone had trouble using a link created for just certain databases,
when
everything is set right. In other words, no reason can be seen why it
wouldn't work? We changed the global name, etc., etc. I can connect to the
database but when I create the link, then try to select from dual from
another database, it says "TNSNames cannot resolve service name". But using
the same service name, I immediately connect successfully to the database!
Driving us crazy. Any help would be greatly appreciated.
Thanks,
Mike
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