Enterprise Data Warehouse Re-Platforming case study hero
All Case Studies
Tier-1 Banking Teradata EDW Southeast Asia

Large-Scale Enterprise
Data Warehouse Re-Platforming

First migration of its scale in the region.

Multi-year Teradata Enterprise Data Warehouse migration program for a Tier-1 Banking Institution in Southeast Asia.

Key Outcomes

~30%

Annual OpEx Reduction

Zero

Regulatory Reporting Failure

Teradata

Legacy Shutdown Achieved

Multi-Year

Transformation Program

Industry & Context

Tier-1 Banking Institution (Southeast Asia)

Multi-year Enterprise Data Warehouse migration program, the first migration of its scale in the region.

Problem Statement

The bank operated a large Teradata Enterprise Data Warehouse supporting:

  • ● Regulatory reporting (Basel III, IAS compliance)
  • ● Risk and finance analytics
  • ● Customer and performance management
  • ● Cross-channel executive reporting

However:

  • ● Infrastructure and licensing costs were escalating
  • ● Vendor dependency risk was increasing
  • ● Hardware lifecycle constraints were emerging
  • ● Scalability limitations were impacting long-term growth

The organization needed to migrate the full EDW ecosystem to a modern target platform, without disrupting regulatory reporting, daily operations, or executive dashboards.

Failure would directly impact regulatory compliance and business continuity.

What Was Structurally Wrong

The challenge was not simply data movement. It was structural:

  • ● Teradata case-insensitive behavior differed from the target database behavior
  • ● Special character handling and key character acceptance varied
  • ● Arithmetic precision and rounding behavior were inconsistent across platforms
  • ● Hashing logic was platform-specific
  • ● ETL control framework required redesign
  • ● Staging-to-target mappings lacked strict one-to-one reconciliation discipline
  • ● Source system change management was not centrally governed during migration

Additionally:

  • ● Parallel run required pre- and post-image reconciliation at scale
  • ● Historical data from tape required phased migration
  • ● All dashboards and reports required recreation and validation
  • ● Hardware sizing required forward-looking buffer capacity

This was not a database migration.

It was a regulatory-grade enterprise re-platforming exercise.

Intervention & Approach

The program was executed over multiple years with structured governance, architectural rigor, and phased execution.

EDW Re-Platforming Approach
1

Infrastructure & Environment Strategy

  • ● Built production-grade development and test environments
  • ● Enabled cross-network data movement before go-live
  • ● Planned 40–50% additional storage headroom for scalability
2

Behavioral Reconciliation & Precision Control

  • ● Tested and aligned rounding and arithmetic precision behaviors across complex SQL operations (SELECT, MINUS, UNION, GROUP BY, etc.)
  • ● Replaced incompatible hashing methods with platform-native logic
  • ● Optimized delta detection using performance-efficient comparison methods
3

Control Framework Modernization

  • ● Implemented automated ETL control framework using structured pattern-based loading: Full Apply, Delta Apply, Insert & Append
  • ● Embedded data typing validation at staging layers
  • ● Generated DDL and transformation logic using macro-driven automation
4

Data Governance & Mapping Discipline

  • ● Enforced one-to-one mapping between legacy and new staging layers
  • ● Implemented column-level masking for development environments
  • ● Retrieved and validated primary keys across all source systems
  • ● Controlled source system changes during migration
5

Organizational Structuring & PMO Governance

  • ● Dedicated security, DBA, and EDW domain resources
  • ● Structured PMO with senior oversight and parallel track management
  • ● Established steering committee for scope and change control

Measurable Business Outcome

EDW Re-Platforming Measurable Outcomes
  • ✓ Successful shutdown of legacy Teradata infrastructure
  • ✓ Zero regulatory reporting failure during migration
  • ✓ Completed parallel run reconciliation without audit exceptions
  • ✓ Improved performance predictability and scalability
  • ✓ Reduced long-term vendor dependency

Most significantly:

Approximately 30% reduction in annual operating expenditure (OpEx)

after migration to the modern target platform

Experience Brought Forward

Expertise and Experience Brought Forward

This experience enables us to support:

  • ● Teradata-to-any-modern-platform re-platforming strategies
  • ● Cross-platform behavioral reconciliation (precision, hashing, case sensitivity)
  • ● Regulatory-grade EDW migrations in financial environments
  • ● Automated ETL control framework modernization
  • ● Infrastructure sizing and parallel-run governance
  • ● Executive-level program management under compliance pressure

We bring this structural migration expertise into new engagements, reducing risk, accelerating modernization, and ensuring cost savings are realized without operational disruption.

All Case Studies Start a Conversation