You could take a look into this: https://confluence.atlassian.com/adminjiraserver071/jira-applications-installation-requirements-802592164.html
This would give you an idea for how much the JAVA heap space, CUPs, Ram, etc, should be for production servers.
If you're looking for evaluation then 500-1024 MB of JAVA heap space is enough. You dont need to have a separate database either.
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