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STRING_SPLIT() in SQL Server 2016 : Follow-Up #1

 Posted by Aaron Bertrand on April 19, 2016  No Responses »
Apr 192016
 

Aaron Bertrand (@AaronBertrand) follows up on a recent post about the performance of STRING_SPLIT() with a few additional reader-motivated tests.

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 Tagged with: CLR, JSON, splitting strings, SQL Server 2016, string splitting, STRING_SPLIT

Performance Surprises and Assumptions : DATEADD()

 Posted by Aaron Bertrand on April 11, 2016  7 Responses »
Apr 112016
 

Aaron Bertrand (@AaronBertrand) explores yet another scenario where a date/time function seems to cause the optimizer to behave unexpectedly.

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 Tagged with: dateadd, datediff, datetime2, execution plan

Changes to a Writable Partition May Fail Unexpectedly

 Posted by Paul White on March 22, 2016  No Responses »
Mar 222016
 

Paul White (@SQL_Kiwi) shows how an update may fail when a partition has some data on a read-only filegroup, and explains several workarounds.

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 Tagged with: delete, partitioning, update

Bad cardinality estimates from SSMS plans – redux

 Posted by Aaron Bertrand on March 4, 2016  4 Responses »
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
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