Cloudant vs OceanBase

What Cloudant is

IBM Cloudant is a proprietary managed JSON document database built on Apache CouchDB, with a compatible HTTPS API and replication protocol. The Lite plan is free for evaluation and fixes capacity at 20 reads, 10 writes and five global queries per second with 1 GB storage. Standard begins at one provisioned capacity block—100 reads, 50 writes and five global queries per second—includes 20 GB and bills capacity plus excess storage hourly. Dedicated Hardware adds workload isolation, private networking and selected compliance and key-management options. A Cloudant service is not the same as self-hosting CouchDB.

What OceanBase is

OceanBase Database is an Apache-2.0 distributed relational database designed for transactional and analytical workloads. Community Edition provides MySQL mode, multitenancy, distributed transactions, replication and horizontal scaling; it is not a complete replacement for every MySQL feature. A single-node deployment is intended for evaluation and lacks distributed high availability, while the documented standard production topology starts with at least three suitably resourced hosts. Enterprise products, cloud service and commercial support are separate decisions.

What Cloudant is built to do

JSON document database

Stores schema-flexible documents, attachments and secondary indexes behind HTTPS APIs.

CouchDB-compatible replication

Supports replication patterns between Cloudant regions and compatible CouchDB systems.

Provisioned throughput

Scales read, write and global-query capacity in linked blocks through the dashboard or API.

IBM IAM and SDKs

Integrates IBM Cloud access controls and provides supported Java, Node.js, Python, Swift, Go and mobile clients.

What OceanBase is built to do

Distributed SQL

Runs relational transactions across a Paxos-backed distributed architecture.

MySQL mode

Offers broad, but explicitly incomplete, compatibility with MySQL 5.7 behavior.

Multitenancy

Separates database tenants and their resources within an OceanBase cluster.

Flexible deployment

Supports standalone evaluation and multi-host production deployment through official tools.

Choose Cloudant if

• Offline or distributed applications that benefit from CouchDB-style replication
• JSON workloads dominated by key lookups and well-designed partitioned queries
• Teams able to test request-class capacity, 429 handling and multi-region conflicts

Skip Cloudant if

• The application depends on relational joins, broad ad-hoc SQL or multi-document ACID transactions
• Traffic is too unpredictable to provision and monitor request-class capacity
• A free Lite instance is being treated as a production SLA or scalable datastore

Choose OceanBase if

• High-scale transactional systems that need horizontal growth and replicated availability
• MySQL-origin applications after a representative compatibility and migration assessment
• Teams able to operate a three-or-more-host database cluster or procure managed service

Skip OceanBase if

• A simple single-node relational database meets the workload and recovery requirements
• The application assumes complete MySQL or Oracle compatibility without testing
• The team cannot staff cluster operations, monitoring, upgrades and restore drills

Cloudant: pros & cons

• Managed document service: IBM handles database servers, upgrades, patching and core high-availability infrastructure.
• CouchDB lineage: Compatible HTTP APIs and replication ease selected CouchDB application and migration patterns.
• Explicit capacity model: Read, write and global-query throughput are provisioned in documented blocks.
• Multi-region option: Application-managed replication can support active-active regional architectures.
• Lite is evaluation capacity: It cannot scale and blocks new writes above its storage limit.
• Capacity dimensions scale together: A workload dominated by one request class may pay for unused allowances in the others.
• Exceeding throughput returns 429: Applications need retry, backoff and load testing rather than assuming automatic unlimited scale.
• Cross-region is not automatic application resilience: Conflict behavior, traffic routing, monitoring and recovery remain design responsibilities.

OceanBase: pros & cons

• Open core database: The main OceanBase Database repository is available under Apache License 2.0.
• Distributed architecture: Paxos-based replication, multitenancy and scale-out target high-availability transactional systems.
• MySQL migration path: Community Edition supports most MySQL 5.7 syntax and features plus selected MySQL 8.0 JSON functions.
• Deployment options: Official tooling covers quick standalone evaluation, standard clusters, containers and Kubernetes.
• Compatibility is partial: Unsupported syntax, functions, backup behavior and architectural differences require application-level testing.
• Meaningful production footprint: The documented standard cluster requires at least three hosts, each starting at 4 vCPU, 16 GB RAM and 100 GB SSD.
• Operational burden: Topology, tenants, storage, upgrades, observability, backup and recovery demand distributed-database expertise.
• Edition boundaries: Oracle mode, management features and expert support differ between Community, Enterprise and Cloud offerings.