Target down, Agent Upload/OMS refresh rate

Using 10.1.0.4.0 Grid Control,. OMS and all agents running on MS platforms.
Currently testing agents, and in particular metrics and alert rates...
The example I need to ask about is this...
We have an agent running on a server, on which several targets exist. We shutdown an Oracle Listener on the server, and after a few mins (this duration varies) we receive an 'Target Down' alert in OMS, and the associated email....
So far, so good...
However, how can the 'alert rate' be changed so that an alert is created immediately following the shutdown of the listener? Also, the alert remains several mins after the listener has been restarted...
The way EM currently works with alerts isn't very useful if users say the application is unavailable, but to DBAs using EM - (for several mins) everything looks okay!
Any help, appreciated :-)

Check uploadinterval in emd.properties:
Here is a description of this parameter
uploadInterval - Number of minutes to wait before the Agent uploads the XML files to the OMS. Default value is 30 (minutes).
You can change this to something lower but be careful about flooding the network if you've decreased it. May be something like 15 minutes will work for you.

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