dbt - Performance Optimization
What will be the effect on warehouse costs if a dbt model removes unnecessary joins from its SQL?
What will be the effect on warehouse costs if a dbt model removes unnecessary joins from its SQL?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand how joins affect query cost
Joins require scanning multiple tables and combining data, increasing compute cost.Step 2: Removing unnecessary joins reduces scanned data and compute time
Fewer joins mean simpler queries and less data processed, lowering costs.Final Answer:
Costs decrease because fewer tables are scanned -> Option DQuick Check:
Less joins = less cost = A [OK]
Quick Trick: Remove unused joins to save costs [OK]
Common Mistakes:
MISTAKES- Assuming joins don't affect cost
- Thinking more joins reduce cost
- Believing joins cause data duplication
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