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Compare Airflow's @daily vs once trigger scheduling.

SQLmedium0.6 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
Google
Key Concepts Tested
airflow
Expert AnswerPremium
124 wordsInterview-ready
**Architectural Logic**: @daily vs once represent fundamentally different scheduling paradigms with distinct cost and operational implications. **@daily (Schedule Interval)**: DAG runs at fixed cron intervals—each execution processes a discrete schedule interval (e.g., midnight-to-midnight). Produces deterministic runs; catchup can trigger historical backfills (cost explosion if catchup=True on long-running DAGs). **Once**: Single execution—manual trigger or one-off; no recurrence....
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