arXiv:2607.13276cs.DB
Aurora DSQL: Scalable, Multi-Region OLTP
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Abstract
Aurora DSQL is a serverless SQL database designed for cloud-scale transaction processing with multi-region active-active capabilities. Built on a disaggregated architecture, DSQL separates compute, storage, and transaction coordination into independent, horizontally scalable services. Query processors run in Firecracker MicroVMs executing PostgreSQL-compatible SQL without local state. The system uses multiversion concurrency control with precision timestamps for coordination-free reads and optimistic concurrency control for writes, deferring coordination to commit time through distributed adjudicators and the Journal replication system. This minimizes cross-region latency by requiring coordination only during commits, not individual statements. DSQL enables elastic scaling from zero to millions of transactions per second while providing strong consistency, ACID transactions, and continuous availability during availability zone or region failures.
Basically, many people convinced themselves that the formalization of CAP means that systems need to choose between highly available and strongly consistent, and hence chose eventual consistency. This is, partially, because Gilbert and Lynch define "availability" to mean…
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