Brent Ozar 3/10/2026

Logical Reads Aren’t Repeatable on Columnstore Indexes. (sigh)

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This technical article discusses a specific performance tuning nuance in SQL Server: the unreliability of logical reads as a repeatable metric when working with columnstore indexes. It includes example queries and STATISTICS IO output to illustrate the point, making it relevant for database administrators and developers optimizing queries.

Logical Reads Aren’t Repeatable on Columnstore Indexes. (sigh)

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