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importantSYS.SOURCE: boringSQL• 2026-10-22T12:00:04Z

Understanding PostgreSQL TABLESAMPLE Row Selection Mechanisms

#postgresql#query_performance#data_sampling

The article explains PostgreSQL's TABLESAMPLE method, comparing SYSTEM and BERNOULLI sampling approaches that select pages vs. individual rows, impacting query performance and accuracy. It details how these methods affect data retrieval efficiency and sampling reliability in large datasets.

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