DEA-C01 Question 60

Community Discussion

Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.

• Chose CE1

  C - Reduces latency and network costs → When Athena queries S3 data in the same AWS Region, data does not cross AWS Regions, improving performance. Lower query execution time → No inter-region data transfer delays. Cost-Effective → AWS charges for cross-region data transfers, but querying within the same region avoids these costs. E - Parquet is a columnar storage format → Queries can fetch only needed columns, reducing scanning costs.

• Chose CE1

  I will go with C and E.

• 1

  C is not mentioned anywhere in the https://docs.aws.amazon.com/athena/latest/ug/performance-tuning.html