AWS DynamoDB Support
DynamoDB global tables for multi-Region applications.
Global tables replicate a table across Regions so users read and write locally and you survive a Regional outage. They also change your design: concurrent writes in different Regions can conflict, replicated writes add cost, and failover needs routing you must build. We set it up and test it.
When You Need This
The situations where this work pays for itself.
Signs it is time
- Users in several Regions need low-latency reads and writes
- You need Regional resilience for a DynamoDB-backed application
- You have a table in one Region and want to add replicas
- Replication appears delayed or items look different across Regions
- You need to plan the cost of a second Region
What you get
- Multi-Region design with conflict handling approach
- Global table configuration in infrastructure as code
- Routing and failover design with test results
- Replication latency alarms and a cost estimate
How we do it
A clear, safe process you can follow along with.
1. Decide if you need it
We separate resilience needs from latency needs. For disaster recovery only, backups or a passive replica may be enough. For active-active, global tables fit.
2. Review data design for conflicts
With the standard model, if the same item is written in two Regions near-simultaneously, the latest write wins. We avoid designs where two Regions update the same item, for example by partitioning ownership by Region or using idempotent updates.
3. Add replicas
We add replica Regions to the table, check capacity settings and auto scaling on each replica, and confirm KMS keys, tags and indexes exist in every Region.
4. Route traffic and handle failover
We use Route 53 or application logic to send users to the nearest Region and to fail over when a Region's health checks fail. The application should retry in another Region.
5. Monitor replication
We watch ReplicationLatency and pending replication metrics and alarm on growth, and verify replicated writes consumption in capacity planning.
6. Test failure and conflicts
We simulate a Region outage in a test environment and run conflict scenarios to confirm behavior matches the design.
7. Understand the consistency model
Standard global tables are eventually consistent across Regions. Newer options for multi-Region strong consistency exist with different trade-offs, so we check which fits.
Mistakes we help you avoid
Common ways this goes wrong, and what we do instead.
Writing the same item from several Regions
Last writer wins can silently discard one update.
Reading from a replica and expecting the latest write
Cross-Region reads are eventually consistent.
Forgetting cost
Each replica pays for storage and replicated writes.
Frequently Asked Questions
How do DynamoDB global tables handle conflicts?
With the standard approach they use last writer wins based on timestamps. Design your writes so conflicts are rare or harmless.
Are global table reads strongly consistent across Regions?
Standard global tables replicate asynchronously, so cross-Region reads are eventually consistent. Strongly consistent reads apply within the Region that took the write.
How fast is global table replication?
Replication is usually within about a second under normal conditions but has no fixed guarantee. Monitor ReplicationLatency for your own figures.
Want Help With DynamoDB global tables for multi-Region applications?
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