A company notices that its nightly ETL jobs are taking longer to complete than expected. What should be the first step in diagnosing and optimizing the performance?

  • Adding more source systems
  • Increasing server capacity
  • Reviewing ETL job logs and performance metrics
  • Rewriting ETL code from scratch
The first step in diagnosing and optimizing ETL performance is to review ETL job logs and performance metrics. This helps identify bottlenecks, such as slow-running queries or resource constraints, that may be causing delays.
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