data gatherer

What is data gatherer. What is it's importance? Is it only for the purpose of using OEM?

As the name suggests, it is used to gather data for the oracle performance manager, spacial index tools and etc. This is soly, used by the OEM. If you are planning to run any statistics related operation from the OEM on Windows, like oracle tuning pack, performance manager and etc, you would require to start the data gatherer on the server where your instance lives.

the way to start it is

vppcntl -start
vppcntl -status

to stop:
vppcntl -stop

Sam

Start Oracle Data Gatherer
vppcntl -start

Stop Oracle Data Gatherer
vppcntl -stop

Verify that Oracle Data Gatherer is running
vppcntl -ping

Identify the version of Oracle Data Gatherer
vppcntl -version

For all the options type in at the prompt as follows.

$vppcntl help