Physical Join Operators in SQL Server - Hash Operator
In the concluding part of the Physical Operators series we look at the Hash operator.
2010-07-12
3,790 reads
Execution Plans
Physical Join Operators in SQL Server - Merge Operator
Part II of the Physical Joins series looks at the Merge operator.
2010-07-05
4,112 reads
Operator of the Week - Lazy Spool
Continuing to illuminate the depths of SQL Server's Query Optimizer, Fabiano shines a light on the sixth major Showplan Operator on his list: the Lazy Spool. What does the Lazy Spool do that's so special, how does the Query Optimizer use it, and why is it so Lazy? Fabiano Amorim explains all.
2010-06-28
2,774 reads
Controlling Execution Plans with Hints
The Query Optimizer gets it right most of the time, but occasionally it chooses a plan that isn't the best possible. You can give the Query Optimiser a better idea by using Table, Join and Query hints. These come with a risk: Any choices you force on the Optimizer by using hints can turn out to be entirely wrong as the database changes with the addition of data over time. Grant Fritchey, in a chapter from his highly acclaimed book, explains further.
2009-11-25
3,275 reads
2009-04-24
3,408 reads
Analyzing the SQL Server Plan Cache
Keeping in mind the importance of the cache mechanism, how could one get the plans and their usage statistics in SQL Server?
2009-01-19
4,183 reads
Graphical Execution Plans for Simple SQL Queries
Learning how to read and analyze execution plans takes time and effort. But once you gain some experience, you will find them an essential skill for getting to grips with performance issues in SQL Server Queries. Grant here describes the range of execution plans for different simple SQL Queries.
2009-01-05
5,326 reads
Blogs
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Question of the Day
Adding new column with DEFAULT II
Which number did the two COUNT(*) return:
DROP TABLE IF EXISTS #tmp CREATE TABLE #tmp (id INT NOT NULL) INSERT INTO #tmp (id) SELECT gs.value FROM GENERATE_SERIES(1, 5) AS gs ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1 SELECT COUNT(*) FROM #tmp AS t WHERE my_value = 1 ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value SELECT COUNT(*) FROM #tmp AS t WHERE my_value = 1See possible answers