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How Airflow stores logs and the role of its backend database

Cloud/Toolseasy0.2 min readPremium

Architectural split: Logs = filesystem or remote (S3/GCS); default logs/dag_id/task_id/date/. Database = metadata (DAGs, runs, task instances, connections)—Postgres/MySQL. Logs not in DB. Best practice: Remote storage (S3/GCS) for logs; retention policy; backup DB; size for DAG...

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Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Walmart
Key Concepts Tested
airflowsql

Why This Question Matters

This easy-level Cloud/Tools question appears frequently in data engineering interviews at companies like Walmart. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (airflow, 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
37 words

Architectural split: Logs = filesystem or remote (S3/GCS); default logs/dag_id/task_id/date/. Database = metadata (DAGs, runs, task instances, connections)—Postgres/MySQL. Logs not in DB. Best practice: Remote storage (S3/GCS) for logs; retention policy; backup DB; size for DAG volume.

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 Cloud/Tools 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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