You have a dbt model that uses ephemeral materialization inside another model. What is the effect of this strategy on the final compiled SQL and database performance?
hard🚀 Application Q9 of 15
dbt - Performance Optimization
You have a dbt model that uses ephemeral materialization inside another model. What is the effect of this strategy on the final compiled SQL and database performance?
AThe ephemeral model materializes as a full table on disk
BThe ephemeral model creates a temporary table in the database
CThe ephemeral model creates a view that must be refreshed
DThe ephemeral model is compiled inline as a CTE, avoiding extra tables or views
Step-by-Step Solution
Solution:
Step 1: Understand ephemeral materialization
Ephemeral models do not create tables or views but compile inline SQL.
Step 2: Effect on compiled SQL and performance
They appear as CTEs in final SQL, reducing database objects and improving performance.
Final Answer:
The ephemeral model is compiled inline as a CTE, avoiding extra tables or views -> Option D
Quick Check:
Ephemeral = inline CTE, no physical object [OK]
Quick Trick:Ephemeral models compile inline, no tables or views created [OK]
Common Mistakes:
MISTAKES
Thinking ephemeral creates temp tables
Assuming ephemeral creates views
Confusing ephemeral with table materialization
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