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

Behavioraleasy0.2 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

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....

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Frequency
Low
Asked at 2 companies
Category
144
questions in Behavioral
Difficulty Split
100E|18M|26H
in this category
Total Bank
1,863
across 7 categories
Part of the Cloud Warehouses (Snowflake & BigQuery) Interview Preparation Hub
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Key Concepts Tested
bigquerysnowflakesql
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.

⚡
Pro Tip

Red Flag: 'One database for everything.' Pro-Move: 'CDC from Postgres to Delta—OLTP stays fast; analytics doesn't load prod.'

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According to DataEngPrep.tech, this is one of the most frequently asked Behavioral interview questions, reported at 2 companies. DataEngPrep.tech maintains an editor-reviewed database of 1,863 data engineering interview questions across 7 categories.

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