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IBM IMS vs IDMS

IBM IMS: IBM's 1960s hierarchical database and transaction manager, still running bank and airline cores on z/OS. IDMS: CODASYL network-model mainframe database, now Broadcom's, still running decades-old COBOL systems.

key differences

  • IBM IMS is primarily a hierarchical database; IDMS is network / navigational.
  • Only IBM IMS has encryption at rest, online schema changes.
  • Only IDMS has joins.

choose ibm-ims for

  • +Core banking ledgers and payment processing
  • +Insurance policy administration
  • +Airline and travel reservation back ends
  • +Exposing legacy IMS transactions as APIs

best at · OLTP

choose idms for

  • +Government and utility billing systems on z/OS
  • +Manufacturing and distribution systems built in the 1980s
  • +Exposing legacy IDMS data via SQL and web services during migration

best at · OLTP

IBM IMSIBM's 1960s hierarchical database and transaction manager, still running bank and airline cores on z/OS.
IDMSCODASYL network-model mainframe database, now Broadcom's, still running decades-old COBOL systems.
overview
Primary model
Hierarchical
Network / Navigational
Also supports
–
Relational
Type
Database engine
Database engine
Status
Active
Active
Developer
IBM
Broadcom (originally Cullinane, Computer Associates)
First release
1968
1973
Latest version
15.6 (Jun 13, 2025)
–
License
ProprietaryProprietary commercial license
ProprietaryProprietary commercial license
Free tier
—
—
popularity
WhichDB Score
7.7
6.2
Rank
#338
#366
GitHub stars
–
–
Stack Overflow questions
–
–
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Large (≤ 1 PB)
Horizontal scaling
Addon
Addon
Multi-region
Read replicas
Read replicas
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
Shared storage, Client server
Client server, Shared storage
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
—
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
–
–
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
DL/I, SQL (IMS Open Database)
DML (navigational), SQL (IDMS SQL option), ADS/Online
Client languages
COBOL, PL/I, Java, C, Assembly
COBOL, PL/I, Assembly, Java
Best for
OLTP
OLTP
Add more to this comparisonNot sure either fits? Try smart match

IBM IMS vs IDMS: FAQ

What is the difference between IBM IMS and IDMS?

IBM IMS: IBM's 1960s hierarchical database and transaction manager, still running bank and airline cores on z/OS. IDMS: CODASYL network-model mainframe database, now Broadcom's, still running decades-old COBOL systems. IBM IMS is primarily a hierarchical database; IDMS is network / navigational. Only IBM IMS has encryption at rest, online schema changes. Only IDMS has joins.

When should I choose IBM IMS over IDMS?

Choose IBM IMS for core banking ledgers and payment processing; insurance policy administration; and airline and travel reservation back ends. Choose IDMS for government and utility billing systems on z/OS; manufacturing and distribution systems built in the 1980s; and exposing legacy IDMS data via SQL and web services during migration.

Is IBM IMS or IDMS more popular?

IBM IMS ranks #338 on the WhichDB Score (7.7/100) and IDMS ranks #366 (6.2/100). Popularity is not fit: check the requirements that matter for your project.

Are IBM IMS and IDMS open source?

No. IBM IMS is proprietary, closed-source software. No. IDMS is proprietary, closed-source software.