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Query Performance Tuning in SQL Server 2014 #devconnections
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scarydba.com grant@scarydba.com @gfritchey
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http://sqlskills.com/blogs/paul/post/survey-results-common-causes-of-performance-problems.aspx
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Query Performance Tuning in SQL Server 7
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Query Performance Tuning in SQL Server 21
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QUERY
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RelationalEngine
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RelationalEngine QueryParsorSyntaxCheck ParseTree
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RelationalEngine QueryParsorSyntaxCheck ParseTree AlgebrizerResolvesObjects QueryProcessorTree
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RelationalEngine QueryParsorSyntaxCheck ParseTree AlgebrizerResolvesObjects QueryProcessorTree Optimizer ExecutionPlan
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DATA RelationalEngine QueryParsorSyntaxCheck ParseTree AlgebrizerResolvesObjects QueryProcessorTree Optimizer ExecutionPlan StorageEngine
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SELECT ID FROM TableA WHERE ID = 42 Table A SCAN SEEK
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SELECT a.ID, b.Name, c.Value FROM TableA as a JOIN TableB as b On a.ID = B.ID JOIN TableC as c ON b.OtherID = c.OtherID WHERE a.ID = 42 324 Possible Plans LOOP HASHMERGE SCAN SEEK
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scarydba.com grant@scarydba.com @gfritchey
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