Haki Benita • 7/26/2023

When Good Correlation is Not Enough

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This technical article analyzes PostgreSQL BRIN (Block Range Index) performance. It details how high correlation in indexed fields can be misleading, leading to slower query execution due to outliers. The author explains the mechanics of BRIN indexes, demonstrates the problem with examples, and introduces PostgreSQL's multi-minmax BRIN index feature as a remedy for these performance issues.

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#postgresql #Query Optimization #Database Performance
When Good Correlation is Not Enough

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