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Apache Cassandra vs ClickHouse

Side-by-side comparison of Apache Cassandra and ClickHouse. Data-driven analysis for CTOs and engineering leaders.

Technical Profile

Apache Cassandra

Scalability
very high
Performance
very high
Learning Curve
steep
Maturity
mature
Languages: Java

ClickHouse

Scalability
very high
Performance
very high
Learning Curve
moderate
Maturity
mature
Languages: C++

When to Use

Apache Cassandra

  • +Need massive write throughput
  • +Multi-datacenter deployment
  • +Time-series data
  • +Always-on availability

Avoid Apache Cassandra when

  • -Complex queries needed
  • -Small team
  • -Limited ops expertise

ClickHouse

  • +Analytics workloads
  • +Real-time dashboards
  • +Log analytics
  • +Large datasets

Avoid ClickHouse when

  • -Transactional workloads
  • -Frequent updates
  • -Small datasets

Compliance & Security

Apache Cassandra

SOC 2GDPRHIPAAPCI-DSS

Security Features

EncryptionAudit LogsRBACMFA

ClickHouse

SOC 2GDPRHIPAAPCI-DSS

Security Features

EncryptionAudit LogsRBACMFA

Operations

Apache Cassandra

Maintenance
high
Monitoring
high
Backup/Recovery
moderate
Hosting: self-hosted, cloud, managed

ClickHouse

Maintenance
medium
Monitoring
medium
Backup/Recovery
moderate
Hosting: self-hosted, cloud, managed

Frequently Asked Questions

How does scalability compare between Apache Cassandra and ClickHouse?

Apache Cassandra offers very-high scalability, while ClickHouse offers very-high scalability. Consider your expected traffic and data volume when choosing.

Which has the easier learning curve: Apache Cassandra or ClickHouse?

Apache Cassandra has a steep learning curve, while ClickHouse has a moderate learning curve. Factor in your team's existing skills and onboarding timeline.

What are the pricing differences between Apache Cassandra and ClickHouse?

Apache Cassandra uses a free pricing model with a free tier. ClickHouse uses a freemium pricing model starting at Cloud: Usage-based with a free tier. Evaluate total cost of ownership including operational overhead.

Which option is better for compliance: Apache Cassandra or ClickHouse?

Apache Cassandra supports SOC 2, GDPR, HIPAA, PCI-DSS. ClickHouse supports SOC 2, GDPR, HIPAA, PCI-DSS. Always verify current certifications directly with the vendor.

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