RE: Advice for dblinks between two prod DBs.


No, even in 9i,  you cannot create Database Links in another schema
as the " <schemaname>."  actually becomes part of the Link name
in the creator's schema --- as you have noticed.

What I do is {as I do not have the other schema's password  -- I
am not supposed to have it } is to use EXECUTE IMMEDIATE

grant create database link to scott;
create or replace procedure scott.tmpcrtdblink22nov06
as
begin
execute immediate 'create database link remote_db connect to remote_user identified by remote_password using ''tns_connect_string'' ' ; 
end;
/

execute scott.tmpcrtdblink22nov06;
drop procedure scott.tmpcrtdblink22nov06;
revoke create database link from scott;

select db_link, username, host from dba_db_links where owner = 'SCOTT';

The remote_user is NOT the owner of the base tables in the remote_db
but another "shadow" account with SELECT only privileges on the base tables.

Similarly, if other users locally need to access the remote database ,
they have their own dblinks --- particularly so when SCOTT and TOM
are accessing different tables and/or with different privileges in remote_db
(thus, using different "shadow" accounts in the remote_db as well).

Since I really don't have database accounts for end-users but only
accounts for applications / application schemas, dblinks are required
only between applications and so it becomes easy to come up with
meaningful names for the "shadow" account {use a name which represents
which application in which database will use this account} and the
dblink name {use a name which represents which database and which
application/schema/shadow the dblink connects to}.

GLOBAL_NAMES,  I leave as FALSE.  TRUE causes problems whenever
I clone databases and forget to change the DBNAME/GLOBAL_NAME etc.
We really don't need it -- it is only mandatory for Advanced Replication
with Multi Master implementations {because it the database name / link name
becomes part of the global_trans_id and so has to be unique}.

Hemant

At 10:16 PM Wednesday, Jesse, Rich wrote:

While testing, I think I've hit my first hurdle.  As of 9i, a DBA can
.......................
  Is there any way to do this without granting CREATE
DATABASE LINK to the owner?
.....................
I'm also struggling with GLOBAL_NAMES true/false.  ....




Hemant K Chitale
http://web.singnet.com.sg/~hkchital


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