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Bad cardinality estimates from SSMS plans – redux

 Posted by Aaron Bertrand on March 4, 2016  1 Response »
Mar 042016
 

Aaron Bertrand (@AaronBertrand) shares some insight about early changes to Plan Explorer that help to provide you with the most accurate information we can.

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 Tagged with: estimates, execution counts, execution plans, key lookups, Management Studio

Can ColumnStore Help Pagination Workloads?

 Posted by Aaron Bertrand on January 15, 2016  1 Response »
Jan 152016
 

Aaron Bertrand (@AaronBertrand) revisits an older post about SQL Server pagination to see if any implementation of ColumnStore indexes can improve performance.

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 Tagged with: columnstore

Optimizing Update Queries

 Posted by Paul White on December 16, 2015  3 Responses »
Dec 162015
 

Paul White (@SQL_Kiwi) spends some time optimizing update queries in order to explore some SQL Server internals.

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 Tagged with: internals, update

More showplan improvements? Yes, please!

 Posted by Aaron Bertrand on December 8, 2015  No Responses »
Dec 082015
 

Aaron Bertrand (@AaronBertrand) highlights a handful of Connect items aimed at improving SQL Server showplan diagnostics and query tuning in general.

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 Tagged with: connect, execution plans, showplan

Hash Joins on Nullable Columns

 Posted by Paul White on November 3, 2015  11 Responses »
Nov 032015
 

Paul White (@SQL_Kiwi) discusses some less well-known query optimizer features and limitations, and explains poor performance of certain hash joins.

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 Tagged with: bitmaps, hash join

Webinar : Query Progress Tracking in SQL Server

 Posted by Blog Admin on October 12, 2015  No Responses »
Oct 122015
 

SQL Server MVP Matan Yungman shows ways to identify specific query bottlenecks while the query is running, mostly using native tools in SQL Server.

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 Tagged with: query progress

Interesting things about INSTEAD OF triggers

 Posted by Paul White on September 11, 2015  7 Responses »
Sep 112015
 

Paul White (@SQL_Kiwi) discusses some things to know about INSTEAD OF triggers – from execution plans and worktables to a cardinality estimation bug in SQL 2014.

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 Tagged with: triggers
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