DynamoDB GSI costs deserve their own review workflow
Understand DynamoDB GSI costs and how Dynasight helps identify unused, underused, and write-heavy global secondary indexes.
Why do DynamoDB GSIs cost money?
DynamoDB global secondary indexes can add storage costs and write costs because DynamoDB stores and maintains index data separately. Dynasight helps teams identify unused, underused, or expensive GSI candidates for review.
- Find indexes with low read value and ongoing cost.
- Connect write-heavy tables to GSI maintenance overhead.
- Review index fit before making schema changes.
Index economics
Every GSI is another access path and another cost surface
GSIs are useful when they match real query patterns. They become costly when the query path disappears, the projection is too broad, or writes keep updating an index that nobody reads.
- Unused indexes can continue consuming storage.
- Write-heavy workloads can pay for index maintenance.
- Broad projections can increase index footprint.
- Old access patterns can leave stale GSIs behind.
How Dynasight helps with GSI cost optimization
Dynasight highlights GSI usage and cost signals together so teams can decide which indexes need dependency checks, redesign, or removal discussions.
FAQ
Common questions
Can a GSI cost money if nobody queries it?
Yes. A GSI can still add storage and write maintenance cost even if application reads no longer use it.
Should I delete every low-traffic GSI?
No. Low traffic can still be business-critical. Dynasight identifies review candidates, but teams should verify dependencies before changing indexes.
How do I lower DynamoDB GSI costs?
Review unused indexes, projections, write-heavy index maintenance, and whether the index still matches current access patterns.
Keep exploring
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Dynasight
Find DynamoDB waste before it becomes normal.
Connect read-only AWS access and turn DynamoDB cost, monitoring, and table design signals into prioritized engineering actions.