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Apache Cassandra vs MongoDB

Side-by-side comparison of Apache Cassandra and MongoDB. 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

MongoDB

Scalability
very high
Performance
high
Learning Curve
easy
Maturity
mature
Languages: C++, JavaScript, Python

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

MongoDB

  • +Rapid schema evolution
  • +Horizontal scaling needed
  • +Document-centric data
  • +Quick prototyping
  • +Hierarchical data structures

Avoid MongoDB when

  • -Complex transactions required
  • -Heavy relational joins
  • -Strong consistency critical
  • -Fixed schema preferred

Compliance & Security

Apache Cassandra

SOC 2GDPRHIPAAPCI-DSS

Security Features

EncryptionAudit LogsRBACMFA

MongoDB

SOC 2GDPRHIPAAPCI-DSS

Security Features

EncryptionAudit LogsRBACMFA

Operations

Apache Cassandra

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

MongoDB

Maintenance
low
Monitoring
low
Backup/Recovery
simple
Hosting: self-hosted, cloud, managed

Frequently Asked Questions

How does scalability compare between Apache Cassandra and MongoDB?

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

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

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

What are the pricing differences between Apache Cassandra and MongoDB?

Apache Cassandra uses a free pricing model with a free tier. MongoDB uses a freemium pricing model starting at Free tier available, paid starts at $57/month with a free tier. Evaluate total cost of ownership including operational overhead.

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

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

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