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Percepções · 6 min de leitura

When to sample a CSV vs. load the entire file in the browser

Preview caps reduce crash risk; understand when sampling biases QA conclusions.

Publicado em 21 de março de 2025 · Table

Products cap rows to protect memory. Sampling is fine for schema checks but risky for tail anomalies or rare event rates, issues may live beyond the first N lines.

Balance

  • Use full load when hardware and limits allow.
  • Stratified sample (head, middle, tail) when forced to sample.
  • Push exhaustive checks to the warehouse when files are huge.

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