whichdb
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Db2 for i vs Oracle Database

Db2 for i: The relational database built into IBM i (AS/400), integrated with the OS and object security. Oracle Database: The enterprise heavyweight: RAC, Data Guard and a converged engine for SQL, JSON, graph and vectors.

key differences

  • Oracle Database is built for larger datasets (≤ 1 PB) than Db2 for i (≤ 10 TB).
  • Horizontal scaling is none in Db2 for i and addon in Oracle Database.
  • Only Oracle Database has vector search, geospatial, change data capture, pub/sub, columnar storage.

choose ibm-db2-for-i for

  • +ERP and distribution systems on IBM i
  • +Regional banking and insurance back ends
  • +Manufacturing execution and warehouse systems
  • +Exposing RPG business logic and data via SQL services and REST

best at · OLTP

choose oracle-database for

  • +Core banking and payment systems
  • +Packaged ERP back ends (Oracle E-Business Suite, JD Edwards, PeopleSoft)
  • +Telecom billing and subscriber management
  • +Mixed OLTP plus in-database analytics and vector search

best at · OLTP, HTAP, Warehouse

Db2 for iThe relational database built into IBM i (AS/400), integrated with the OS and object security.
Oracle DatabaseThe enterprise heavyweight: RAC, Data Guard and a converged engine for SQL, JSON, graph and vectors.
overview
Primary model
Relational
Relational
Also supports
Document
Document, Graph, Vector, Spatial, XML
Type
Database engine
Database engine
Status
Active
Active
Developer
IBM
Oracle Corporation
First release
1988
1979
Latest version
IBM i 7.6 TR2 (Jul 2026)
23.26.4 (26ai RU) (Oct 2026)
License
ProprietaryProprietary commercial license
ProprietaryOracle commercial license
Free tier
—
✓
popularity
WhichDB Score
4.3
56.9
Rank
#410
#17
GitHub stars
–
–
Stack Overflow questions
999
152.3K
scale & guarantees
Comfortable data size
Medium (≤ 10 TB)
Large (≤ 1 PB)
Horizontal scaling
None
Addon
Multi-region
Read replicas
Active active
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
Single node, Multi primary, Shared storage
Client server, Primary replica, Shared storage, Distributed
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
✓
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
IBM Cloud
Oracle Cloud, AWS, Azure, Google Cloud
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, SQL PL, RPG record-level access
SQL, PL/SQL, SQL/PGQ
Client languages
RPG, COBOL, Java, Python, JavaScript, C#, PHP
Java, Python, JavaScript, C#, Go, C, C++, PHP
Best for
OLTP
OLTP, HTAP, Warehouse, Vector search
Add more to this comparisonNot sure either fits? Try smart match

Db2 for i vs Oracle Database: FAQ

What is the difference between Db2 for i and Oracle Database?

Db2 for i: The relational database built into IBM i (AS/400), integrated with the OS and object security. Oracle Database: The enterprise heavyweight: RAC, Data Guard and a converged engine for SQL, JSON, graph and vectors. Oracle Database is built for larger datasets (≤ 1 PB) than Db2 for i (≤ 10 TB). Horizontal scaling is none in Db2 for i and addon in Oracle Database. Only Oracle Database has vector search, geospatial, change data capture, pub/sub, columnar storage.

When should I choose Db2 for i over Oracle Database?

Choose Db2 for i for ERP and distribution systems on IBM i; regional banking and insurance back ends; and manufacturing execution and warehouse systems. Choose Oracle Database for core banking and payment systems; packaged ERP back ends (Oracle E-Business Suite, JD Edwards, PeopleSoft); and telecom billing and subscriber management.

Is Db2 for i or Oracle Database more popular?

Oracle Database ranks #17 on the WhichDB Score (56.9/100) and Db2 for i ranks #410 (4.3/100). Popularity is not fit: check the requirements that matter for your project.

Are Db2 for i and Oracle Database open source?

No. Db2 for i is proprietary, closed-source software. No. Oracle Database is proprietary, closed-source software. License: Oracle commercial license.