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Teradata to Hadoop migration and handling data with SCD Type 2?

SQLmedium0.7 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Citi
Key Concepts Tested
joinpartitionsparkwindow
Expert AnswerPremium
140 wordsInterview-ready
Teradata to Hadoop migration with SCD Type 2 requires careful planning. Key steps: (1) Schema mapping—map Teradata tables to Hive/Spark equivalents; handle Teradata-specific functions. (2) SCD Type 2 logic—maintain current and historical rows using effective_date, effective_end_date, and is_current flag. In Spark: use MERGE (Delta) or upsert logic with window functions to detect changes. (3) Migration strategy—batch historical load first, then CDC for ongoing changes....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Citi. The answer also includes follow-up discussion points that interviewers commonly explore.

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