The database is where most systems live or die. You can scale stateless app servers all day by adding boxes, but the database holds state, and state is stubborn — it's the part that doesn't parallelize for free. So this post is about the two questions that matter most: which kind of database to pick, and what to do when one machine can't hold your data anymore.
This is part five of my system design fundamentals series.
I am a Software Engineer and Lead Project Manager at Sparkout Tech Solutions Pvt Ltd. I enjoy turning complex problems into simple, beautiful, and intuitive solutions.
I occasionally build some open-source software for myself, stock trader and an avid football player and cricket fan.
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