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Comdb2 vs PostgreSQL

Comdb2: Bloomberg's clustered relational database with optimistic concurrency and synchronous replication. PostgreSQL: The extensible, standards-first open-source relational database.

key differences

  • Horizontal scaling is manual in Comdb2 and addon in PostgreSQL.
  • Only PostgreSQL has full-text search, vector search, geospatial, materialized views.

choose comdb2 for

  • +Highly available financial OLTP systems
  • +Event delivery via database queues and triggers
  • +Clusters needing strong consistency across nodes

best at · OLTP, Queue, Tick data

choose postgresql for

  • +General-purpose application backend
  • +SaaS multi-tenant data
  • +Geospatial applications with PostGIS
  • +Semantic search alongside relational data with pgvector

best at · OLTP, Geo, Search

Comdb2Bloomberg's clustered relational database with optimistic concurrency and synchronous replication.
PostgreSQLThe extensible, standards-first open-source relational database.
overview
Primary model
Relational
Relational
Also supports
–
Document, Spatial
Type
Database engine
Database engine
Status
Active
Active
Developer
Bloomberg
PostgreSQL Global Development Group
First release
2004
1996
Latest version
8.2.556 (Oct 24, 2026)
18.6 (Aug 13, 2026)
License
Open source (permissive)Apache License 2.0
Open source (permissive)PostgreSQL License
Free tier
✓
✓
popularity
WhichDB Score
10.9
93.2
Rank
#291
#1
GitHub stars
1.5K
22.6K
Stack Overflow questions
–
178.8K
scale & guarantees
Comfortable data size
Medium (≤ 10 TB)
Medium (≤ 10 TB)
Horizontal scaling
Manual
Addon
Multi-region
Read replicas
Read replicas
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
Distributed, Multi primary, Client server
Single node, Primary replica, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
—
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
–
AWS, Google Cloud, Azure, Oracle Cloud, IBM Cloud, Alibaba 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, Lua
SQL, PL/pgSQL
Client languages
C, Java, Go, Python, JavaScript
C, Java, Python, JavaScript, Go, Rust, C#, Ruby
Best for
OLTP, Queue, Tick data
OLTP, Geo, Search, Content
Add more to this comparisonNot sure either fits? Try smart match

Comdb2 vs PostgreSQL: FAQ

What is the difference between Comdb2 and PostgreSQL?

Comdb2: Bloomberg's clustered relational database with optimistic concurrency and synchronous replication. PostgreSQL: The extensible, standards-first open-source relational database. Horizontal scaling is manual in Comdb2 and addon in PostgreSQL. Only PostgreSQL has full-text search, vector search, geospatial, materialized views.

When should I choose Comdb2 over PostgreSQL?

Choose Comdb2 for highly available financial OLTP systems; event delivery via database queues and triggers; and clusters needing strong consistency across nodes. Choose PostgreSQL for general-purpose application backend, SaaS multi-tenant data and geospatial applications with PostGIS.

Is Comdb2 or PostgreSQL more popular?

PostgreSQL ranks #1 on the WhichDB Score (93.2/100) and Comdb2 ranks #291 (10.9/100). Popularity is not fit: check the requirements that matter for your project.

Are Comdb2 and PostgreSQL open source?

Yes. Comdb2 is open source. License: Apache License 2.0. Yes. PostgreSQL is open source. License: PostgreSQL License.