steven_nospam at Yahoo! Canada wrote:
> The Oracle listener process will write to the listener.log, but
> otherwise pretty much just provides details to the Oracle DB writer on
> what needs to be done on the system. I would not think it would need to
> do a lot of writing except to a sequential ascii text file on one of
> the disks.

Our Oracle 10gR2 environment actually logged quite a bit (50-80mb per
day) when
it was on.(about 1300 users)
Heavy logging also by http access_log and jserv.log. We keep our logs
off, then turn on
when investigating issue. We do run all error_logs (these should be
nearly empty)

It can easily be turned off....then turned on by exception if you want.
Link may help:

http://www.psoug.org/reference/listener.html