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External Article

The Myth of Over-Normalization

Too often, denormalization is suggested as the first thing to consider when tackling query performance problems. It is said to be a necessary compromise to be made when a rigorous logical design hits an inadequate database system. As the saying goes, “Normalize ‘til it hurts, then denormalize ‘til it works”. In reality, Denormalization always leads eventually to tears.

2008-07-28

7,924 reads

Technical Article

Monitoring Report Execution Performance with Execution Logs

This article presents an excerpt from the book, Microsoft SQL Server 2005 Reporting Services Step by Step, by Stacia Misner and Hitachi Consulting. Learn how to monitor reporting services by implementing an execution logging database and reviewing reports that query that database.

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2008-07-25

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Question of the Day

Adding new column with DEFAULT

Which number will the COUNT() return after executing the following statements:

DROP TABLE IF EXISTS #test;
CREATE TABLE #test (id INT)
INSERT INTO #test (id)
SELECT *
  FROM GENERATE_SERIES(1, 3) AS gs
;

ALTER TABLE #test ADD flag BIT CONSTRAINT DF_#test_flag DEFAULT 0;
go
UPDATE #test SET flag = 0 WHERE id = 1
UPDATE #test SET flag = 1 WHERE id = 2

INSERT INTO #test (id) VALUES (4)

SELECT COUNT(*)
  FROM #test AS t
 WHERE flag = 0
 

See possible answers