whichdb
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CockroachDB vs Comdb2

CockroachDB: Postgres-wire distributed SQL built to survive node, zone and region failures with serializable transactions. Comdb2: Bloomberg's clustered relational database with optimistic concurrency and synchronous replication.

key differences

  • Licensing: CockroachDB is source-available (CockroachDB Software License); Comdb2 is open source (permissive) (Apache License 2.0).
  • CockroachDB is built for larger datasets (≤ 1 PB) than Comdb2 (≤ 10 TB).
  • Horizontal scaling is native in CockroachDB and manual in Comdb2.
  • Only CockroachDB has full-text search, vector search, geospatial, materialized views, ttl / expiry.
  • Only Comdb2 has pub/sub.
  • CockroachDB has a serverless option; Comdb2 does not.

choose cockroachdb for

  • +Global payments and ledger systems of record
  • +Identity, account and session metadata across regions
  • +Inventory and order management with strict consistency
  • +Data-residency workloads that must pin rows to a country

best at · OLTP, Geo, Metadata

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

CockroachDBPostgres-wire distributed SQL built to survive node, zone and region failures with serializable transactions.
Comdb2Bloomberg's clustered relational database with optimistic concurrency and synchronous replication.
overview
Primary model
Relational
Relational
Also supports
Document, Spatial, Vector
–
Type
Database engine
Database engine
Status
Active
Active
Developer
Cockroach Labs
Bloomberg
First release
2015
2004
Latest version
26.3 (Aug 19, 2026)
8.2.556 (Oct 24, 2026)
License
Source-availableCockroachDB Software License
Open source (permissive)Apache License 2.0
Free tier
✓
✓
popularity
WhichDB Score
47.1
10.9
Rank
#33
#291
GitHub stars
32.6K
1.5K
Stack Overflow questions
467
–
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Medium (≤ 10 TB)
Horizontal scaling
Native
Manual
Multi-region
Active active
Read replicas
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
Distributed, Multi primary, Client server, Serverless
Distributed, Multi primary, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
—
Serverless
✓
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Google Cloud, Azure
–
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, PL/pgSQL
SQL, Lua
Client languages
Java, Go, Python, JavaScript, C#, Ruby, Rust, PHP
C, Java, Go, Python, JavaScript
Best for
OLTP, Geo, Metadata, Ledger
OLTP, Queue, Tick data
Add more to this comparisonNot sure either fits? Try smart match

CockroachDB vs Comdb2: FAQ

What is the difference between CockroachDB and Comdb2?

CockroachDB: Postgres-wire distributed SQL built to survive node, zone and region failures with serializable transactions. Comdb2: Bloomberg's clustered relational database with optimistic concurrency and synchronous replication. Licensing: CockroachDB is source-available (CockroachDB Software License); Comdb2 is open source (permissive) (Apache License 2.0). CockroachDB is built for larger datasets (≤ 1 PB) than Comdb2 (≤ 10 TB). Horizontal scaling is native in CockroachDB and manual in Comdb2.

When should I choose CockroachDB over Comdb2?

Choose CockroachDB for global payments and ledger systems of record; identity, account and session metadata across regions; and inventory and order management with strict consistency. Choose Comdb2 for highly available financial OLTP systems; event delivery via database queues and triggers; and clusters needing strong consistency across nodes.

Is CockroachDB or Comdb2 more popular?

CockroachDB ranks #33 on the WhichDB Score (47.1/100) and Comdb2 ranks #291 (10.9/100). Popularity is not fit: check the requirements that matter for your project.

Are CockroachDB and Comdb2 open source?

Not in the OSI sense. CockroachDB is source-available: you can read the code, but the license restricts some uses, typically offering it as a competing managed service. License: CockroachDB Software License. Yes. Comdb2 is open source. License: Apache License 2.0.