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What database would you choose for handling transactional and non-transactional data? Why?

Behavioraleasy0.2 min readPremium

Situation: Mixed OLTP and OLAP. Task: Recommend with rationale. Action: Why separate: OLTP needs ACID, low latency; OLAP needs scans, columnar. Polyglot: PostgreSQL/Aurora for OLTP; Snowflake/BigQuery or Delta for OLAP. Sync via CDC. Single-store (CockroachDB) trades off....

🤖 Analyze Your Answer
Frequency
Low
Asked at 1 company
Category
144
questions in Behavioral
Difficulty Split
100E|18M|26H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Meesho
Key Concepts Tested
bigquerysnowflakesql

Why This Question Matters

This easy-level Behavioral question appears frequently in data engineering interviews at companies like Meesho. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (bigquery, snowflake, sql) will help you answer variations of this question confidently.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
42 words

Situation: Mixed OLTP and OLAP. Task: Recommend with rationale. Action: Why separate: OLTP needs ACID, low latency; OLAP needs scans, columnar. Polyglot: PostgreSQL/Aurora for OLTP; Snowflake/BigQuery or Delta for OLAP. Sync via CDC. Single-store (CockroachDB) trades off. Result: Right tool per workload.

The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations covering performance optimization and real-world examples.

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According to DataEngPrep.tech, this is one of the most frequently asked Behavioral interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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