> ## Documentation Index
> Fetch the complete documentation index at: https://rajanand.org/llms.txt
> Use this file to discover all available pages before exploring further.

# SSIS to ADF Migration Questions

## ADF Migration Strategy and Planning

<AccordionGroup>
  <Accordion title="🔎 What are the key considerations when planning a migration of SSIS packages to ADF?" defaultOpen="true">
    * Assess the complexity and dependencies of existing SSIS packages.
    * Identify which packages can be migrated as-is using Azure-SSIS Integration Runtime and which need to be rebuilt as ADF pipelines.
    * Plan for data source and destination compatibility (e.g., on-premise vs. cloud).
    * Consider performance, scalability, and cost implications of the migration.
  </Accordion>

  <Accordion title="🔎 How do you prioritize SSIS packages for migration to ADF?">
    * Prioritize based on business criticality and frequency of execution.
    * Start with simpler packages to build confidence and gain experience.
    * Address complex or high-impact packages later, with a well-tested approach.
  </Accordion>
</AccordionGroup>

## Technical Migration Scenarios

<AccordionGroup>
  <Accordion title="🔎 How do you migrate an SSIS package that uses a Script Component to ADF??">
    * Replace the Script Component with ADF Mapping Data Flows or Azure Functions for custom logic.
    * Use Data Flow transformations (e.g., Derived Column, Aggregate) for simpler logic.
    * If the Script Component interacts with external systems, use Web Activities or Custom Activities in ADF.
  </Accordion>

  <Accordion title="🔎 How do you handle SSIS packages that use third-party components or custom DLLs in ADF?">
    * Rebuild the functionality using native ADF components or Azure Functions.
    * If the third-party component is critical, consider using Azure-SSIS Integration Runtime to run the package as-is.
    * Evaluate if the third-party component has a cloud-native alternative.
  </Accordion>

  <Accordion title="🔎 How do you migrate SSIS packages that use CDC (Change Data Capture) to ADF?">
    * Use ADF’s Change Data Capture (CDC) capabilities or Temporal Tables in Azure SQL Database.
    * Implement incremental load patterns using Watermarking or Lookup Activities in ADF.
    * Use Mapping Data Flows to handle transformations for incremental data.
  </Accordion>
</AccordionGroup>

## Performance Optimization in ADF Migration

<AccordionGroup>
  <Accordion title="🔎 How do you ensure performance parity when migrating SSIS packages to ADF?">
    * Optimize Data Flows by reducing unnecessary transformations and using partitioning.
    * Use Integration Runtime scaling (e.g., increase Data Integration Units or use Self-Hosted IR for on-premise sources).
    * Leverage PolyBase or COPY INTO for high-performance data loading into Synapse or SQL Database.
  </Accordion>

  <Accordion title="🔎 How do you handle large data volumes during migration to ADF?">
    * Use partitioning in source and target systems to parallelize data transfer.
    * Implement incremental loads to reduce the volume of data transferred.
    * Use compression and binary format for efficient data transfer.
  </Accordion>
</AccordionGroup>

## Error Handling and Monitoring

<AccordionGroup>
  <Accordion title="🔎 How do you replicate SSIS error handling (e.g., Event Handlers, Error Output) in ADF?">
    * Use ADF’s Fault Tolerance settings in Data Flows to handle errors (e.g., skip or redirect erroneous rows).
    * Implement Activity Retries and Timeouts for transient failures.
    * Use Azure Monitor and Log Analytics for centralized logging and alerting.
  </Accordion>

  <Accordion title="🔎 How do you monitor the execution of migrated ADF pipelines?">
    * Use Azure Monitor to track pipeline runs, durations, and failures.
    * Set up Alerts for pipeline failures or performance bottlenecks.
    * Use Log Analytics to analyze detailed execution logs and troubleshoot issues.
  </Accordion>
</AccordionGroup>

## Data Security and Compliance

<AccordionGroup>
  <Accordion title="🔎 How do you handle sensitive data (e.g., PII) during migration to ADF?">
    * Use Azure Key Vault to store and manage sensitive information (e.g., connection strings, passwords).
    * Implement Data Masking or Encryption for sensitive data in transit and at rest.
    * Ensure compliance with data protection regulations (e.g., GDPR, HIPAA) by using Azure Policy and Role-Based Access Control (RBAC).
  </Accordion>

  <Accordion title="🔎 How do you ensure data integrity during migration to ADF?">
    * Use Data Validation Activities to compare source and target data.
    * Implement Checksum or Row Count validation to ensure data completeness.
    * Use Transaction Management in target systems (e.g., Azure SQL Database) to ensure [atomicity](/glossary/acid-properties).
  </Accordion>
</AccordionGroup>

## Advanced ADF Features

<AccordionGroup>
  <Accordion title="🔎 How do you use Mapping Data Flows in ADF to replace SSIS Data Flow tasks?">
    * Use Source and Sink transformations to read and write data.
    * Apply Transformations (e.g., Derived Column, Aggregate, Join) to replicate SSIS logic.
    * Use Parameterization and Expression Builder for dynamic configurations.
  </Accordion>

  <Accordion title="🔎 How do you implement incremental loads in ADF?">
    * Use Watermarking to track the last processed record.
    * Implement Lookup Activities to compare source and target data.
    * Use Filter Transformation in Mapping Data Flows to process only new or updated records.
  </Accordion>
</AccordionGroup>

## Real-World Migration Scenarios

<AccordionGroup>
  <Accordion title="🔎 You have an SSIS package that extracts data from an on-premise SQL Server, transforms it, and loads it into a cloud data warehouse. How would you migrate this to ADF?">
    * Use Self-Hosted Integration Runtime to connect to the on-premise SQL Server.
    * Rebuild the transformation logic using Mapping Data Flows or Databricks.
    * Load the transformed data into the cloud data warehouse (e.g., Azure Synapse or SQL Database) using Copy Data Activity.
  </Accordion>

  <Accordion title="🔎 How would you migrate an SSIS package that uses FTP to transfer files to ADF?">
    * Use FTP Linked Service in ADF to connect to the FTP server.
    * Use Copy Data Activity to transfer files to Azure Blob Storage or ADLS.
    * Optionally, use Azure Logic Apps or Azure Functions for advanced file processing.
  </Accordion>
</AccordionGroup>

## Post-Migration Validation

<AccordionGroup>
  <Accordion title="🔎 How do you validate the success of an SSIS-to-ADF migration?">
    * Compare source and target data using Data Validation Activities or custom queries.
    * Validate pipeline execution logs for errors or performance issues.
    * Conduct User Acceptance Testing (UAT) with stakeholders to ensure business requirements are met.
  </Accordion>

  <Accordion title="🔎 How do you handle rollback in case of a failed migration?">
    * Maintain a backup of the original SSIS packages and databases.
    * Use Version Control (e.g., Git) for ADF pipelines to revert changes if needed.
    * Implement Automated Testing to detect issues early in the migration process.
  </Accordion>
</AccordionGroup>