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The article argues that single-threaded, aggressively sharded databases can effectively address common issues faced by traditional SQL databases, especially under high load. It highlights the complications of locking and concurrency in multi-threaded systems and proposes a model where each shard has a single writer to simplify transactions and reduce deadlocks.
This article discusses the challenges of ensuring consistency in systems that use separate databases for transactions and master data. It highlights the "Write Last, Read First" principle to manage operations across these systems, emphasizing the importance of designating a system of record and ensuring idempotency in operations.