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index is not working while using ROW_NUMBER


index is not working while using ROW_NUMBER

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Anuj Rathi
Anuj Rathi
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thanks for this valuable advice.
Anuj Rathi
Anuj Rathi
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SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)SSC Journeyman (99 reputation)

Group: General Forum Members
Points: 99 Visits: 176
If I use any other column which is in NCI (& not PK), then this is a seek.
NCI is same in both situations. Difference is only is Row_Number order by column. Please check the attached two execution plans. One is Row_Number with PK & second one is Row_Number with any other column.

one shows SCAN & another one shows SEEK. Difference is only in Row_Number order by column.
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RowNum_with_PK.png (1 view, 36.00 KB)
RowNum_with_NCI_Column.png (0 views, 39.00 KB)
GilaMonster
GilaMonster
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Please post table definitions, index definitions and execution plan, as per http://www.sqlservercentral.com/articles/SQLServerCentral/66909/

Pictures of the plan are pretty useless.


Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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