Usage of COMMIT NOWAIT, BATCH

I just want to conduct a poll :
How frequent and in what circumstances do you use or see used the "ALTER SYSTEM|SESSION COMMIT_WRITE = nowait, batch ; " ?

1. How frequently ?
2. What type of application / under what circumstances ?
3. At SYSTEM or SESSION level ?
4. For a limited duration during a Sesion or throughout a Session ?

Hemant K Chitale
http://hemantoracledba.blogspot.com

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