Case Studies/Financial Services
Informix to Oracle Migration for a Leading US Bank
Leading US Regional BankUnited States12 months
Zero
Data loss
40%
Performance gain
100%
Schema converted
<2 hrs
Cutover window
Case study highlightsAt a glance —
At a glance —
the essentials.
The Customer
Leading US Regional Bank
Industry: Financial ServicesRegion: United StatesDuration: 12 months
Database MigrationApplication RefactoringPerformance Tuning
Business Challenge
- The bank's core lending application ran on an aging Informix database with limited vendor support, growing license risk, and performance ceilings that were beginning to constrain product launches.
- Decades of Informix-specific stored procedures, ESQL/C code, and proprietary data types meant a naive migration would break dozens of integrated systems.
Our Solution
- Kumaran built an automated schema and PL/SQL conversion toolkit calibrated to the bank's coding patterns, achieving high-fidelity translation of stored procedures, triggers, and packages.
- Application code was systematically refactored to Oracle JDBC, with a regression suite generated from production traces to validate behavior end-to-end.
- Oracle GoldenGate provided real-time replication during a parallel-run period, enabling a sub-two-hour final cutover with full rollback capability.
Key Results
- 100% of the schema and stored logic was successfully converted with zero data loss across the cutover window.
- Average query response improved by 40% on the new Oracle 19c platform, with headroom to support the next decade of growth.
- License and support risk was eliminated, and the bank's database team gained a modern foundation for analytics and AI initiatives.
By the numbers
Zero
Data loss
40%
Performance gain
100%
Schema converted
<2 hrs
Cutover window
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Go deeper —
download the PDF.
The downloadable report includes the complete technical narrative beyond the highlights above:
- Platform Specifications — Hardware, OS, runtime environment, and infrastructure topology — including detailed configuration of the source and target platforms.
- Architecture Diagrams — Before-and-after system topology, data flows, integration patterns, and component interaction maps from the production deployment.
- Project Scope — Workstreams, team structure, governance model, RACI matrix, and the phased delivery plan that kept stakeholders aligned.
- Migration Methodology — Phased cutover plan, parallel-run validation harness, automated regression strategy, and rollback playbook used to de-risk production changes.
- Performance Engineering — Bottleneck analysis, tuning techniques, and benchmarking results that drove the measured efficiency gains.
- Lessons Learned — What worked, what we'd do differently, and the reusable patterns we now apply to similar modernization programs.
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Full breakdown — challenge, approach, results & metrics.
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