We recently upgraded our BI environment in 11gR2 (11.2.0.4). Yes, October 2014 and we upgraded in 11gR2 while the end of premium 11gR2 support in January 2015, fortunately first year of extended support is offered…
Processes initialization parameter has not been changed but we reach the limit (200) and I wanted to check how many connections were initiated over the window where we faced issues. I found the nice presentation of Tanel Poder located at Troubleshooting Complex Performance Issues – Part1 and found the information I wanted using the 10gR2 old fashion listener.log in old text format.