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Missing Index Query Text: Linking Suggestions to Their Queries

June 29, 2014
Pinal Dave
SQL Performance
Execution Plan, SQL DMV, SQL Index

A missing index suggestion means more when you can see its query. Here is how to link them, trim the text and test the index.

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Unstable Queries: Finding Wide Duration Swings in Query Store

May 3, 2014
Pinal Dave
SQL Performance
Execution Plan, Query Store, SQL DMV, SQL Server

Find unstable queries with Query Store duration spread, weight averages, and separate plan changes from waits and parameter effects.

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Execution plan for SQL server query.

SQL SERVER – Does Use of CTE Change the Order of Join in Inner Join

March 24, 2014
Pinal Dave
SQL Tips and Tricks
CTE, Execution Plan, SQL Joins

A reader said he uses a CTE to control join order. Does a CTE change the order of join in an inner join? Here is what I found.

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Exponential Backoff: How SQL Server Estimates Several Filters

February 21, 2014
Pinal Dave
SQL Tips and Tricks
Execution Plan, SQL Performance, SQL Statistics

The plan guessed 89 rows and 500 came back. Here is the rule behind that guess, and what to do about it.

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SSMS Keyboard Shortcuts Worth Learning

February 2, 2014
Pinal Dave
SQL Tips and Tricks
Execution Plan, SQL Server, SQL Server Management Studio, SQL Shortcut

SSMS keyboard shortcuts for execution, comments, results, and Object Explorer remove repeated clicks while keeping query context visible.

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Nested Loops Join: When It Is the Right Choice

January 18, 2014
Pinal Dave
SQL Tips and Tricks
Execution Plan, SQL Index, SQL Joins

Loops in a plan are not always the villain. Count the inner executions and the reads before you force another join type.

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Reading DBCC SHOW_STATISTICS Step by Step

January 3, 2014
Pinal Dave
SQL Performance
Execution Plan, SQL Server, SQL Server DBCC, SQL Statistics

Read SHOW_STATISTICS headers, density and histogram boundaries, compare estimates with your plan, and query the histogram directly.

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