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If you don't have the resources and have no option to increase them then you have to drop something. I would shutdown the "observer".
The other option is to cut the "observer" resources. It needs very little, 2GB is a lot for that.
Also, what OS are you running on the laptop and within the VM's ?
You can run Oracle 11 on VMware with as little as 1GB of RAM.
The observer can be completely stripped down, it does very little work.
I can run 3 Oracle 188.8.131.52 databases on Red Hat 5 in vmware using Windows 7 as a host. I use 1 CPU ( core ) each for the VM's and 1.2 GB memory. No issues. Cut your memory and you won't waste CPU on swap you don't need.
Edited by: mseberg on Mar 27, 2013 7:37 AM
Since this is for education purpose i would recommend you to do the following:
Check the memory on windows:
1-Check the available memory left on the latop and try to close any unseeded applications. This should save for you 2 gigas additional and say 2 giga for the OS. 2-If this didn't work then please reduce the database memory assigned for the SGA to 1.5 or 2 giga although oracle recommends that the memory to be 2 giga at least but since it is for education then lets try that. I think if you do this it would be ok however i still think 8 giga RAM would be enought to assign 2 giga memory for each database and run ok.I have installed oracle RAC on a laptop similar to that one before and everything was going ok.
Please user ALT+CTRL+DELETE to see where your OS memory is consumed on windows machine.