DynamoDB strong multi-Region consistency reaches 15 Regions
Serguey Asael Shinder2 min readFive more AWS Regions can now take part in a DynamoDB global table that is strongly consistent across Regions - the feature AWS abbreviates to MRSC. The additions are Mumbai and Singapore in Asia Pacific, Stockholm and Spain in Europe, and Central Canada, taking the supported total to 15. Announced on 23 September 2026 at https://aws.amazon.com/about-aws/whats-new/2026/09/dynamodb-mrsc-additional-regions/.
An MRSC global table can now be built from any three-Region configuration among those 15, either as three replicas or as two replicas plus one witness Region. AWS states explicitly that this includes configurations spanning North America, Europe and Asia Pacific.
The property being offered is a recovery point objective of zero, with strongly consistent reads served from a nearby endpoint and the application staying available during a Regional impairment.
What it means
The news is the geography, not the feature, and geography is what this feature is made of. Consistency of that kind across Regions is bounded by the speed of light and by how many failure domains a write must reach before it is acknowledged. Moving from a menu that keeps a quorum inside one continent to one that may straddle three changes which architectures are expressible at all.
The witness Region is the option to understand before choosing. Two replicas plus a witness cost less than three full replicas and still supply a third vote for the quorum, but a witness is not a replica, so it is not somewhere reads can be served from. Choosing it trades read locality for cost, and that trade is precisely what the three-Region decision is about.
⚠️ AWS's own framing is worth keeping: MRSC is offered for the strict-consistency workloads it names, such as user profiles, inventory tracking, order state and entitlements. A quorum spanning continents adds latency to every write by construction, which is why the feature is scoped to cases where that consistency is worth paying for rather than offered as a default.