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What is the difference between OLTP and OLAP?

SQLmedium0.4 min readPremium
Frequency
Low
Asked at 2 companies
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
ChryselysEY
Key Concepts Tested
bigquerysnowflake
Expert AnswerPremium
89 wordsInterview-ready
**Architectural Logic:** OLTP optimizes for transactional throughput (high-frequency, small, ACID reads/writes); OLAP for analytical throughput (complex aggregations, scans, read-heavy). **Why separate:** Schema and indexing are opposites—OLTP uses narrow indexes and normalization; OLAP uses columnar storage and denormalized star schemas. **Scalability:** OLTP scales vertically and via sharding; OLAP scales horizontally via MPP (e.g., Snowflake, BigQuery, Redshift)....
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 Chryselys, EY. The answer also includes follow-up discussion points that interviewers commonly explore.

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