OIC interview questions and answers

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  🌐 Oracle Integration Cloud (OIC) – Interview Questions & Answers

  🗓 Updated: March 11, 2025
  👨‍💼 Author: [Your Name or Company Name]

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  💡 What is Oracle Integration Cloud (OIC)?

  Oracle Integration Cloud (OIC) is a powerful Platform as a Service (PaaS) that helps organizations connect applications, automate processes, and streamline data integration across cloud and on-premise systems.

  🧱 Key OIC Components:

  • 🔄 Integration Cloud Service (ICS): Build and run integrations

  • 🧰 Visual Builder Cloud Service (VBCS): Low-code app development

  • 🔁 Process Cloud Service (PCS): Automate workflows and business processes

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  🔁 Common Integration Patterns in OIC

  Pattern	Description	Example
  Scheduled Orchestration	Triggers integration on a timed schedule	🕓 Run every 4 hours to import journal files via FTP
  App-Driven Orchestration	Starts via API or external event	🛒 REST endpoint receives order, pushes to ERP
  Basic Routing	Direct data flow with simple mapping	👥 Send HCM employee data to Fusion Apps
  File Transfer	Moves files across systems	💰 Upload payment files to bank FTP
  Publish to OIC	Sends messages to internal OIC topics	📣 Broadcast a payload to subscribers
  Subscribe to OIC	Listens to topic messages	📥 Inserts data into a DB when message arrives

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  🔍 Key Differences: Basic Routing vs App-Driven Orchestration

  Feature	Basic Routing	App-Driven Orchestration
  Use Case	Simple 1:1 integration	Complex logic with conditions
  Components	Single mapping	Orchestration with loops, switches
  Example	Employee sync	Order processing workflow

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  🧩 Essential OIC Components Explained

  🔌 Adapters:

  • File Adapter – Works via agent, supports files up to 10 MB.

  • FTP Adapter – Directly connects to FTP; supports 1 GB+ files.

  • Database Adapters (ATP/DBaaS) – Uses wallets/agents for secure connections.

  🌉 Connectivity Agent:

  • Secure bridge between OIC and on-prem systems (HTTPS, port 443).

  • Limits: 10 MB per payload (can segment large files).

  • Install via: java -jar connectivityagent.jar (after setting InstallerProfile.cfg)

  🧾 ERP Cloud Adapter:

  • Requires roles: Integration Specialist, SOAOperator.

  • Configure CSF Key for callback support.

  • Use metadata refresh if catalog sync lags (~30 mins wait time).

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  🔬 When to Use ERP Adapter vs. Generic Adapters

  Use ERP Cloud Adapter	Use SOAP/REST Adapters
  ✔️ Pre-built catalog/API	✔️ Custom or unsupported APIs
  ✔️ Built-in callback support	❗ Manual XSD/JSON import required

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  🚀 Advanced Features and Patterns

  📥 FBDI Integrations

  • Use for bulk file uploads into Fusion ERP

  • Supports callback status monitoring

  🧮 Global Variables & Data Stitching

  • Define reusable variables (primitive or complex types)

  • Use ASSIGN, APPEND, REMOVE in Stitch for payload manipulation

  🧯 Error Handling

  • Try-Catch per scope + Global fault handler

  • Use Throw for custom faults, Rethrow to escalate

  • Use “Parking Lot Pattern” for async error resubmission

  📊 Logging & Monitoring

  • Use short-term OIC logger or persist logs in DB/VBCS

  • Implement “heartbeat” checks for external endpoints

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  🧪 Versioning, CI/CD & Feature Flags

  • Semantic versioning (v1.0.2, v2.3.1, etc.)

  • Automate deployments via OIC REST APIs

  • Integrate with GitHub/Jenkins for CI/CD

  • Feature flags progress from Internal → Controlled → GA (log SR for early access)

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  🔐 Security & Certificates

  • OIC integrates with IDCS SSO

  • Use Service Accounts for system-to-system calls (bypass SSO)

  • Import 3rd-party SSL certificates via:
    Settings → Certificates → Import

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  📦 Lookups & Packages

  • Lookups = Domain constants/value maps

  • Packages (.par) = Group and export integrations across environments

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  🎯 Interview Tips & Focus Areas

  🎤 Topics to Highlight:

  • Real-world use cases: FTP → ERP file imports, retry patterns

  • Error handling strategies (sync vs async)

  • SOAP vs REST, XSDs, and when to use each

  • Queues vs Topics in Publish/Subscribe

  • REST verbs (GET, POST, PUT, DELETE)

  • CI/CD implementation with OIC APIs

  🧠 Troubleshooting Knowledge:

  • Metadata refresh for stale WSDLs

  • Dealing with agent connection failures

  • Handling locked or suspended integrations

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  📚 Final Thoughts

  Oracle Integration Cloud (OIC) continues to be a cornerstone of enterprise cloud connectivity, and mastering it can unlock powerful automation and data orchestration capabilities. Preparing for an interview? Use this guide to solidify your fundamentals and demonstrate real-world knowledge with confidence.

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