BigQuery Slots are units of compute capacity. One slot represents the ability to execute one query unit of work (e.g., scanning 1 column of data). Slots are shared across queries in a project. On-demand: Google allocates slots dynamically; you pay per TB processed. Flat-rate: Reserve slots (100–5000) for predictable workloads; cost is fixed. Slots impact concurrency—more slots allow more parallel queries....
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