Looks like you need a bit more TEMP tablespace. You may want to consider using BIGFILE temp tablespace.
We do have quite some performance numbers on bulk loads.
Please refer to the first entry in the following public wiki page.
Hope it helps,
I could try that - but why not do some commits during the load?
Kind regards - Christian
Please feel free to contact me directly at souripriya dot das at oracle dot com.
If possible, please include the (event trace) content from the RDF$ET_TAB table.