ExpertGCP PCA · Question 06 · Domain 1: Designing and Planning a Cloud Solution Architecture
CASE STUDY: RetailMart
Overview: Global e-commerce, 5,000 employees. Legacy monolith on VMware, 20TB Oracle DB on-prem.
Business: Modernize to microservices, 100% uptime during Black Friday (10x traffic), real-time inventory sync, exit data center in 2 years.
Executives:
- CEO: "Innovate faster to beat online-only competitors."
- CFO: "End hardware CAPEX. Move to pure OPEX."
- CTO: "Break monolith safely. Zero downtime during transition."
Tech: Migrate off Oracle to open-source, containerize, secure hybrid connectivity during transition, automated scaling.
Constraints: Zero downtime for storefront, heavy reliance on Oracle stored procedures, all hybrid traffic must be private/encrypted.
Which migration approach should you recommend to safely break down the monolith with zero downtime?
CASE STUDY: RetailMart
Overview: Global e-commerce, 5,000 employees. Legacy monolith on VMware, 20TB Oracle DB on-prem.
Business: Modernize to microservices, 100% uptime during Black Friday (10x traffic), real-time inventory sync, exit data center in 2 years.
Executives:
- CEO: "Innovate faster to beat online-only competitors."
- CFO: "End hardware CAPEX. Move to pure OPEX."
- CTO: "Break monolith safely. Zero downtime during transition."
Tech: Migrate off Oracle to open-source, containerize, secure hybrid connectivity during transition, automated scaling.
Constraints: Zero downtime for storefront, heavy reliance on Oracle stored procedures, all hybrid traffic must be private/encrypted.
Which migration approach should you recommend to safely break down the monolith with zero downtime?
Answer options:
Perform a big-bang migration during a low-traffic maintenance window.
Use the Strangler Fig pattern to incrementally migrate services to GKE while routing traffic via an API Gateway.
Lift and shift the VMware VMs to Google Cloud VMware Engine (GCVE) and keep it as a monolith.
Rewrite the entire application in Cloud Run before migrating any traffic.
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