It was a abnormal day for facing the issue with the memory consumption with my 4GB RAM system.
Started work by making nautilus on to have some files to be written and modified from root user.
After the work forgot to close the nautilus session manually and continued to work with the session and soon I faced the issue of my system getting hanged a little and then after few hours it was hasrd to do any thing figured out the problem that nautilus was taking all the memory of my system.
I looked into the matter and figured out the solution by killing the process and freed my memory and after that I loved to work again for long hours.
Here is the solution that I applied to my problem:
Open Terminal and run the command as :
ps aux | grep nautilus
Then after that used the command to kill the process as :
kill -9 <process_id>
This saved the time and issue that I was facing. Would love to know more on this.
Enjoy learning :)