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ClickHouse vs Qserv

ClickHouse: Open-source columnar OLAP database known for very fast aggregations over billions of rows. Qserv: Distributed shared-nothing SQL database built to serve the Rubin Observatory's petascale sky catalogs.

key differences

  • ClickHouse is primarily a columnar / OLAP database; Qserv is relational.
  • Licensing: ClickHouse is open source (permissive) (Apache License 2.0); Qserv is open source (copyleft) (GNU General Public License v3.0).
  • ClickHouse is built for larger datasets (Multi-PB) than Qserv (≤ 1 PB).
  • Only ClickHouse has full-text search, vector search, json, materialized views, ttl / expiry.
  • ClickHouse has a serverless option; Qserv does not.

choose clickhouse for

  • +Product and web analytics
  • +Log and observability backends
  • +Real-time dashboards over event streams
  • +Time-series and IoT metrics at scale

best at · Real-time analytics, OLAP, Observability

choose qserv for

  • +Serving petascale astronomical object and source catalogs
  • +Spatial cone and box searches over sky surveys
  • +Large read-mostly scientific tables partitioned by position

best at · OLAP, Scientific, Geo

ClickHouseOpen-source columnar OLAP database known for very fast aggregations over billions of rows.
QservDistributed shared-nothing SQL database built to serve the Rubin Observatory's petascale sky catalogs.
overview
Primary model
Columnar / OLAP
Relational
Also supports
Relational, Document, Vector, Time-Series
Spatial
Type
Database engine
Database engine
Status
Active
Active
Developer
ClickHouse, Inc.
SLAC National Accelerator Laboratory / Vera C. Rubin Observatory
First release
2016
2011
Latest version
26.10.2.103 (Oct 24, 2026)
2026.10.2-rc2 (Oct 12, 2026)
License
Open source (permissive)Apache License 2.0
Open source (copyleft)GNU General Public License v3.0
Free tier
✓
✓
popularity
WhichDB Score
69.8
0.8
Rank
#10
#610
GitHub stars
50.6K
36
Stack Overflow questions
2.2K
–
scale & guarantees
Comfortable data size
Massive (Multi-PB)
Large (≤ 1 PB)
Horizontal scaling
Native
Native
Multi-region
Read replicas
None
ACID
Limited
Limited
Consistency
Eventual
Eventual
Schema
Strict
Strict
Architecture
Distributed, Shared storage, Single node, Client server
Distributed, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
—
Serverless
✓
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Google Cloud, Azure, Alibaba Cloud, Tencent Cloud, Aiven
–
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 (ClickHouse dialect), PRQL, KQL (experimental)
SQL (Qserv dialect)
Client languages
Python, Go, Java, JavaScript, Rust, C++, C#
Python, C++, Java
Best for
Real-time analytics, OLAP, Observability, Warehouse
OLAP, Scientific, Geo
Add more to this comparisonNot sure either fits? Try smart match

ClickHouse vs Qserv: FAQ

What is the difference between ClickHouse and Qserv?

ClickHouse: Open-source columnar OLAP database known for very fast aggregations over billions of rows. Qserv: Distributed shared-nothing SQL database built to serve the Rubin Observatory's petascale sky catalogs. ClickHouse is primarily a columnar / OLAP database; Qserv is relational. Licensing: ClickHouse is open source (permissive) (Apache License 2.0); Qserv is open source (copyleft) (GNU General Public License v3.0). ClickHouse is built for larger datasets (Multi-PB) than Qserv (≤ 1 PB).

When should I choose ClickHouse over Qserv?

Choose ClickHouse for product and web analytics; log and observability backends; and real-time dashboards over event streams. Choose Qserv for serving petascale astronomical object and source catalogs; spatial cone and box searches over sky surveys; and large read-mostly scientific tables partitioned by position.

Is ClickHouse or Qserv more popular?

ClickHouse ranks #10 on the WhichDB Score (69.8/100) and Qserv ranks #610 (0.8/100). Popularity is not fit: check the requirements that matter for your project.

Are ClickHouse and Qserv open source?

Yes. ClickHouse is open source. License: Apache License 2.0. Yes. Qserv is open source. License: GNU General Public License v3.0.