Crucial Exams

AWS Certified Data Engineer Associate DEA-C01 Practice Question

An Amazon Redshift fact table ingests 5 million clickstream rows per hour. The table uses EVEN distribution and a compound sort key on event_time. Most analytics dashboards retrieve individual user sessions by filtering on session_id equality. Occasional monthly reports aggregate data by event_time range. Data engineers notice that session queries now require full table scans. Which schema change will most improve session query performance with minimal impact on load time?

  • Keep EVEN distribution but switch the sort key to session_id only.

  • Change the distribution style to KEY on session_id and retain the existing event_time sort key.

  • Replace the compound sort key with an interleaved sort key on session_id and event_time.

  • Convert the table to ALL distribution and set session_id as the sort key.

AWS Certified Data Engineer Associate DEA-C01
Data Store Management
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