Crucial Exams

AWS Certified Data Engineer Associate DEA-C01 Practice Question

An Amazon Redshift RA3 cluster contains a 6 TB fact table and three small dimension tables. A data engineer runs the same SQL statement every morning to join these tables and calculate yesterday's metrics, but the query currently finishes in about 20 minutes. Distribution styles must remain unchanged, and any solution should have minimal additional cost. Which SQL-level change will most likely reduce the query runtime to under two minutes?

  • Rewrite the query as a UNION ALL of separate SELECT statements filtered by each dimension value.

  • Add compound sort keys on every column referenced in the query predicates for all joined tables.

  • Run the query twice each morning so the second execution uses Amazon Redshift's result cache.

  • Create a materialized view that pre-joins the fact and dimension tables and refresh it incrementally each day.

AWS Certified Data Engineer Associate DEA-C01
Data Ingestion and Transformation
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