Cardinality Estimates

External Article

Fixing Gatekeeper Row Cardinality Estimate Issues

  • Article

The Query Optimiser needs a good estimate of the number of rows likely to be returned by each physical operator in order to select the best query plan from the most likely alternatives. Sometimes these estimates can go so wildly wrong as to result in a very slow query. Joe Sack shows how it can happen with SQL Queries on a data warehouse with a star schema.

2012-12-10

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Question of the Day

Running Steve's Code

Can you run this code in any of your SQL Server 2019 databases without error? 

CREATE OR ALTER PROCEDURE [dbo].[StevesAmazingProc]
AS
    
        SELECT Consumer_ID ,
               Trend_Category ,
               Bit_Trace
        FROM    NewWorldDB.dbo.MarketTrend;
    
GO

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