Purpose of DB links

Dear all
I'am new in this feild please don't mine if u think as it's silly question.
my question is why we are use DB link. Does it not possible to access the other database users from simple networking means configure listener and tns. please explain me in detail what's the actual purpose of dblink

user12230768 wrote:
Dear all
I'am new in this feild please don't mine if u think as it's silly question.
my question is why we are use DB link. Does it not possible to access the other database users from simple networking means configure listener and tns. please explain me in detail what's the actual purpose of dblinkIn addition to what the others said, as a bit of additional clarification --- a dblink allows one database to act as a client to another.
So, I connect to DB1 using some client, let's say sqlplus. Then I ussue a query using the link, like
select empname from emp@dblink_to_db2Then db will, in turn, establish its own connection to DB2 (using the same client to server mechanism as any other client) and pass the query on.
The real value would be when you want to combine data from two different databases into a single query:
select a.emp,
b.address
from emp a,
em2@link_to_db2 b;

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[http://help.sap.com/saphelp_nw04/helpdata/en/58/54f9c1562d104c9465dabd816f3f24/content.htm]
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Ans
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3. If you are still experiencing issues, then please create a testcase on apex.oracle.com and update this thread with the workspace details so I can take a look.
Test case details are given below. It was created per ORACLE for open Service Request Number 3-1938902931 on ORACLE Metalink.
Workspace: contract4
username: [email protected] (my email)
Password: contract4
Comments:
For my migration/testing purpose a dabatase link and synonyms have been setup by our ORACLE DBA. Could this be causing this problem?
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