How to Optimize BigQuery Queries with Partition Skew

Christian Baghai
4 min readNov 18, 2023

Partition skew is a common problem that affects the performance and cost of BigQuery queries. It occurs when the data is unevenly distributed across partitions, resulting in some partitions having more data than others. This can cause BigQuery to scan more data than necessary, use more resources, and take longer to execute the query.

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