OBIEE is installed in Linux machine, when Report is exported or agent is running Temp files are created in /temp folder which is utilizing more space. This is happening from 1 month.
11g is quite old and Oracle will most definitely suggest that you upgrade before they'll even ask for log files...
You haven't mentioned what analysis is being executed when you see these large temp files. How large is the analysis that causes the large temp files? Is this some sort of data dump used by the end user in Excel?