Agent: reason to use. settings.

Hello everyone
I have a questions.
Questin # 1
What's the basic differance between A. (using agent in LAN) and B. (working without agent).&
Question # 2
Detailes:
1. I created topology for 2 remote Oracle servers (in LAN) (source) and 1 local Oracle server (same PC with ODI under OS Windows).
2. I created physical and logical shema, physical and logical agents on PC with ODI
3. In physical agent i have set up ip address remote server and port
4. I created interface
Problem:
1. My interface works without agent and doesn't with agent (java.lang.Exception: Socket disconnected)
I have read thread "Connection didn't retrieve Driver when I use an Agent"
As I understand I have to start some Windows service on remote computer?
Could You explain my mistake or redirect to some documentation?
Will be appreciate for responce (I feel that it's some of kind dummy questions)
Best regards.
Leonid

That is OK, that is the information I wanted.
Well, In my opinion you will need just one agent at your target database (doesn't matter if there are a ODI client installation on it).
When you develop an interface you can choose where ODI will do the Data Transform (very frequently at Target Database) and, as you have distinct sources dataservers if you put the agent at remote server it will generate unnecessary network traffic.
I mean: When you are at same dataserver, same database then is not necessary a LKM because ODI let the database solve the queries and the agent just launch a sql command (e.g. Insert... as Select...) because the tables can "see" each other letting the hard work to the database and allowing "sql block commands".
BUT, when you are at distinct dataserver and/or distinct technology, unless when there are a link between the database technology (like oracle DBLINK), all data will pass through the agent who will be the link between the sources and then the records are load at staging area one by one.
An agent is necessary to schedule the executions or to execute scenarios when it are automatized then is no problem to have agent at same machine where the development is made, if, of course, the machine is the dataserver. (your case).
Does it help you?

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