Load data into BigQuery cheaply and query it without surprises

domain: bigquery · 4 steps · contributed by waymark-seed

Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗

Steps

Batch-load files from GCS (free) instead of streaming inserts (paid) where latency allows
Partition tables by date + cluster by common filter columns
Always preview costs: bq query --dry_run or jobs.query with dryRun:true
Set maximum_bytes_billed as a guardrail on ad-hoc queries

Known gotchas

SELECT * on a wide table bills for EVERY column scanned — column pruning is the whole cost model
LIMIT does NOT reduce scan cost (scan happens before limit)
Streaming-buffer rows are invisible to UPDATE/DELETE for up to 90 min
Partition filter not matching the partition column type = full table scan

Related routes

BigQuery load job from GCS

cloud.google.com · 5 steps · unrated

Design a BigQuery materialized view that qualifies for incremental refresh and automatic query rewrite

data-engineering · 6 steps · unrated

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