SQL Server Columnstore Performance Tuning Eric N Hanson Principal Program Manager Microsoft Corporation

demo Outer Join Performance Limit

8 bitmap of qualifying rows Column vectors Batch object

select Date, count(*) from dbo.Purchase where Date >= group by Date

Physical DB Design, Loading, and Index Management

Maximizing the Benefits of Segment Elimination

partition 1 Date = segment 1 min(Date) = , max(Date) = segment 2 “ segment 3 “ segment 4 “ segment 5 “ partition 2 Date = segment 1 min(Date) = , max(Date) = segment 2 “ segment 3 “ segment 4 “ segment 5 “

select f.region_id, avg(f.duration) from fact_CDR f where f.region_id = 1 and f.date_id between and group by f.region_id

Additional Tuning Considerations

DateLicenseNumMeasure XYZ ABC DateLicenseIdMeasure LicenseIdLicenseNum 1XYZ123 2ABC777

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