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Tuning Workloads

duckdb.org

Parallelism (Multi-Core Processing) The Effect of Row Groups on Parallelism DuckDB parallelizes the workload based on row groups, i.e., groups of rows that are stored together at the storage level. A row group in DuckDB's database format consists of max. 122,880 rows. Parallelism starts at the level of row groups, therefore, for a query to run on k threads, it needs to scan at least k * 122,880 rows. Too Many Thread…

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