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Asked: 2026-05-22T18:06:31+00:00

I am new to partitioning. Would be there a difference in performance between select

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I am new to partitioning.

Would be there a difference in performance between 

select * from my_partitionedData where date = '20110523'

and 

select * from my_Data where date = '20110523'

where my_partitionedData is a table partitioned by date by 1 day and my_Data is a table which has only data for '20110523' and both tables have same structure?

The other question – would be there a difference in performance in running these selects if all the partitions of the my_partitionedData are in the same file group? (note – the select is always for 1 day)

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1 Answer

  1. Editorial Team

    Like everything else in SQL, you will need to test to be sure.

    That being said, I think you should get identical performance.

    Behind the scenes, a partitioned table is basically a lot of smaller tables logically unioned together. If you are partitioning by day in you partitioned table, and your non-part table has only one day of data, the execution plan and performance should be pretty much identical.

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