Yes ,To increase the number of processes.

Current value is 150 . Im planning to increase it to 200 or 250.

But my worry is, will it affect anywhere else in the system.. Do I need to provide more space in SGA or PGA? because we have only 4Gb RAM in which I have mentioned SGA = 700 MB and PGA = 100 MB..And I have enabled Automatic Share Memory Management.

Please let me know which part of the system will affected by increasing the number of processes? Also what are all the negative part (if any) by increasing the processes