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Oracle DBCA utility: “Listener is not up or database service is not registered with it”

I'm a software engineer with some experience on SQL Server but a newbie on Oracle. I'm attempting to run dbca on a remote linux machine to reconfigure a database that was initially configured to idle ...
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What are the 'free to use' workload generators available for Oracle?

A couple that I know about are http://www.dominicgiles.com/swingbench.html and http://hammerora.sourceforge.net/ Are there any others? I am looking for tools what can generate random workload ...