ODI Agent - when do i need to use?

can anybody explain me the perpose of ODI Agent? and when do i need to use Agent?
Edited by: knidhi on Oct 5, 2009 3:31 PM
Edited by: knidhi on Oct 5, 2009 4:07 PM

If I could finesse your answer slightly, hopefully to help (or confuse):
There are multiple agent types:
- the Local (No agent): this opens additional threads in the current GUI process. The agent will just run as additional threads in your current process, using the same settings as your GUI environment.
- a standalone agent: if you start an agent from the commandline using the agent.sh/bat. This will start a "listener agent". It starts up and passively listens for execution requests. When a request is passed to the agent, it includes all the necessary information to connect to the repository etc. All this information is there in the invocation package. (for more information on what is passed look at the documentation for the invocation API or at the ODIInvoke webservice)
- a scheduler agent: when you start a scheduler agent from the commandline with the agentscheduler.bat/sh file, it will read from the odiparams.sh/bat file the connectivity paramaters for the repository, where it will "look itself up" based on the agent name passed, to find out what scenarios it should be scheduling. This agent may also take requests, just like the standalone agent described above.
- a task may also be invoved at the opertaing system command level using startscen.bat/sh. This will start a standlone agent for the duration of this execution only, which not listen for other requests, it reads its parameters from the command line (for which sceenario, version and context) and from the odiparams file for the repository connectivity parameters as to where to find the requested scenario and where the execution will be logged.

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