---
title: "Discussion on \"Understanding BigQuery Datastream Staleness: The Freshness-vs-Cost Knob Nobody Reads the Docs On\" | Hashnode"
description: "Discussion on \"Understanding BigQuery Datastream Staleness: The Freshness-vs-Cost Knob Nobody Reads the Docs On\". If you've ever set up a Datastream pipeline replicating a transactional database (PostgreSQL, MySQL, Oracle, SQL Server) into BigQuery and then wondered why your \"real-time\" data is actually 10-15 min"
url: "https://hashnode.com/posts/understanding-bigquery-datastream-staleness-the-freshness-vs-cost-knob-nobody-reads-the-docs-on/6a7c94083bf16d911331e475"
---

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# [Understanding BigQuery Datastream Staleness: The Freshness-vs-Cost Knob Nobody Reads the Docs On](https://syntax-soul.hashnode.dev/understanding-bigquery-datastream-staleness-the-freshness-vs-cost-knob-nobody-reads-the-docs-on?utm_source=hashnode&utm_medium=feed)

If you've ever set up a Datastream pipeline replicating a transactional database (PostgreSQL, MySQL, Oracle, SQL Server) into BigQuery and then wondered why your "real-time" data is actually 10-15 min

Aug 12 · 5 min read · syntax-soul.hashnode.dev  
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## Written by

[Mayank Jain](https://hashnode.com/@mayankj)

@mayankj · Delhi, India

  
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