Data Store in Memory or Database

Everywhere we have good and bad attributes. We need to select good attribute according to our requirement.Memory having very big problem that when System can’t give you enough memory at that time it throws MemoryOutOfBoundException. It is very rar kind of case and can’t catch in general circumsences. If we think to storeit in database then Time Complexity is there. So, What to do in this kind of case? and how to find better Solution?

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