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How does partitioning in S3 affect Athena query performance?

SQLmedium0.2 min readPremium
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Capco
Key Concepts Tested
partition
Expert AnswerPremium
45 wordsInterview-ready
**S3 layout**: s3://bucket/dt=2024-01-01/region=US/—Hive-style. **Athena**: WHERE dt='2024-01-01' skips irrelevant partitions; only scans matching prefix. **Cost**: $5/TB scanned; partition pruning = less scan = lower cost. **Catalog**: Glue MSCK REPAIR or add partitions. **Best**: Partition by high-filter columns; columnar format (Parquet)....
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