What are the ways to acheive high scalability ?
Sounds like homework to me. Show some effort before posting.
Google for "scalability", maybe also with "java", and see what you find. Ask some specific questions on JavaRanch at that time and you will likely get good answers.
We've gotta get close enough to that helmet to pull the choke on it's engine and flood his mind! Or, we could just read this tiny ad:
RavenDB is an Open Source NoSQL Database that’s fully transactional (ACID) across your database
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All times above are in ranch (not your local) time.
The current ranch time is
Mar 18, 2019 16:19:28.