whichdb
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SingleStore vs Volt Active Data (VoltDB)

SingleStore: Distributed SQL mixing in-memory rowstore and columnstore for real-time analytics, search and vectors. Volt Active Data (VoltDB): In-memory, partitioned SQL engine running Java stored procedures serially for millisecond decisioning.

key differences

  • SingleStore is built for larger datasets (≤ 1 PB) than Volt Active Data (VoltDB) (≤ 10 TB).
  • Only SingleStore has full-text search, vector search, columnar storage, compression, encryption at rest.
  • Only Volt Active Data (VoltDB) has materialized views, ttl / expiry, pub/sub.

choose singlestore for

  • +Real-time customer-facing analytics
  • +Fraud detection and risk scoring on streaming data
  • +Ad-tech and IoT ingestion with immediate querying
  • +Hybrid vector plus keyword search for RAG

best at · HTAP, Real-time analytics, Vector search

choose volt-active-data for

  • +Telecom online charging and policy control
  • +Real-time fraud and risk decisions
  • +Ad bidding and personalization at high TPS
  • +Gaming leaderboards and in-game economies

best at · OLTP, Real-time analytics, Streaming

SingleStoreDistributed SQL mixing in-memory rowstore and columnstore for real-time analytics, search and vectors.
Volt Active Data (VoltDB)In-memory, partitioned SQL engine running Java stored procedures serially for millisecond decisioning.
overview
Primary model
Relational
Relational
Also supports
Columnar / OLAP, Document, Vector, Search Engine, Spatial
Document, Spatial
Type
Database engine
Database engine
Status
Active
Active
Developer
SingleStore, Inc.
Volt Active Data, Inc.
First release
2013
2010
Latest version
9.0.44 (Sep 24, 2026)
16.0.0 (Sep 30, 2026)
License
ProprietaryProprietary (free developer/standard licenses with limits)
ProprietaryProprietary (commercial)
Free tier
✓
—
popularity
WhichDB Score
29.0
20.7
Rank
#92
#154
GitHub stars
–
–
Stack Overflow questions
403
153
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Medium (≤ 10 TB)
Horizontal scaling
Native
Native
Multi-region
Read replicas
Active active
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
Distributed, In memory, Client server
Distributed, In memory, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
—
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Google Cloud, Azure
AWS, Google Cloud
capabilities
Transactions
✓
✓
Joins
✓
✓
Secondary indexes
✓
✓
Full-text search
✓
—
Vector search
✓
—
Geospatial
✓
✓
JSON
✓
✓
Change data capture
✓
✓
Triggers
—
—
Stored procedures
✓
✓
Materialized views
—
✓
TTL / expiry
—
✓
Pub/Sub
—
✓
Columnar storage
✓
—
In-memory
✓
✓
Durable persistence
✓
✓
Compression
✓
—
Encryption at rest
✓
—
Role-based access
✓
✓
Time travel
—
—
Branching
—
—
Online schema changes
✓
✓
Streaming ingest
✓
✓
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL, MPSQL (stored procedures)
SQL, Java (stored procedures)
Client languages
Java, Python, JavaScript, Go, C#, PHP, Rust
Java, Python, C++, Go, C#, JavaScript
Best for
HTAP, Real-time analytics, Vector search, Search
OLTP, Real-time analytics, Streaming, Tick data
Add more to this comparisonNot sure either fits? Try smart match

SingleStore vs Volt Active Data (VoltDB): FAQ

What is the difference between SingleStore and Volt Active Data (VoltDB)?

SingleStore: Distributed SQL mixing in-memory rowstore and columnstore for real-time analytics, search and vectors. Volt Active Data (VoltDB): In-memory, partitioned SQL engine running Java stored procedures serially for millisecond decisioning. SingleStore is built for larger datasets (≤ 1 PB) than Volt Active Data (VoltDB) (≤ 10 TB). Only SingleStore has full-text search, vector search, columnar storage, compression, encryption at rest. Only Volt Active Data (VoltDB) has materialized views, ttl / expiry, pub/sub.

When should I choose SingleStore over Volt Active Data (VoltDB)?

Choose SingleStore for real-time customer-facing analytics; fraud detection and risk scoring on streaming data; and ad-tech and IoT ingestion with immediate querying. Choose Volt Active Data (VoltDB) for telecom online charging and policy control; real-time fraud and risk decisions; and ad bidding and personalization at high TPS.

Is SingleStore or Volt Active Data (VoltDB) more popular?

SingleStore ranks #92 on the WhichDB Score (29.0/100) and Volt Active Data (VoltDB) ranks #154 (20.7/100). Popularity is not fit: check the requirements that matter for your project.

Are SingleStore and Volt Active Data (VoltDB) open source?

No. SingleStore is proprietary, closed-source software. No. Volt Active Data (VoltDB) is proprietary, closed-source software.