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Reason for Migrating SQL 2012 to SQL 2014


Reason for Migrating SQL 2012 to SQL 2014

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Erland Sommarskog
Erland Sommarskog
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There is a "product guide" which you can download, which gives some more information:

Query-processing enhancements

New cardinality estimator
The cardinality estimator improves the querying process and offers the following benefits:


  • Consistent, predictable query performance: Different operator trees that represent the same relation have the same cardinality estimates.


  • New model for better performance: Significant changes to the model result in more accurate cardinality estimates and better plan choices.


  • Easier to support: The querying process separates querying into two steps, decision-making and execution. It also produces tracing output to facilitate troubleshooting.



Earlier statistics invalidation
Improvements to trigger the automatic update of statistics enable better query results, because statistics invalidation occurs earlier in SQL Server 2014. Faster and more frequent refreshes of statistics are possible because the invalidation threshold has been set to 20 percent of a single partition.

Parallel SELECT INTO
Data-loading is significantly faster because data insertion into a table can occur in parallel through the SELECT INTO operation.

Erland Sommarskog, SQL Server MVP, www.sommarskog.se
Jason-299789
Jason-299789
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Andreas Wolter-332291 (7/16/2013)
Even though SQL 2014 is by far not complete in CTP1 and more is to come, you should be ready for a new way of developing Datawarehouses - if In-Memory-OLTP is not enough "developer-stuff" for you.
Why is that?
Because it can be foreseen, that from that release on, ColumnStore will be the new standard storage-format for Facts as well as Dimensions - which is a big shift from anything before.

You can read some more on the reasons behind here: www.insidesql.org/blogs/andreaswolter/2013/06/sql-server-2014-columnstore-indexes-batch-mode-improvements


cheers,

Andreas


Quick question on this, with the 2012 Columns stores they where memory intensive in during thier creation and also took longer than a Clustered index to apply.

Is this still the case?

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Andreas.Wolter
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Jason-299789 (7/30/2013)
Andreas Wolter-332291 (7/16/2013)
Even though SQL 2014 is by far not complete in CTP1 and more is to come, you should be ready for a new way of developing Datawarehouses - if In-Memory-OLTP is not enough "developer-stuff" for you.
Why is that?
Because it can be foreseen, that from that release on, ColumnStore will be the new standard storage-format for Facts as well as Dimensions - which is a big shift from anything before.

You can read some more on the reasons behind here: www.insidesql.org/blogs/andreaswolter/2013/06/sql-server-2014-columnstore-indexes-batch-mode-improvements


cheers,

Andreas


Quick question on this, with the 2012 Columns stores they where memory intensive in during thier creation and also took longer than a Clustered index to apply.

Is this still the case?


Hi
I haven't tested and compared it directly, but the memory handling has been improved a lot, so I would expect it to behave better in comparison. But I have no idea by which extend

Andreas

---------------------------------------------------
MVP SQL Server
Microsoft Certified Master SQL Server 2008
Microsoft Certified Solutions Master Data Platform, SQL Server 2012
www.insidesql.org/blogs/andreaswolter
www.andreas-wolter.com
Jason-299789
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Andreas,

Thanks for the feedback, it will be interesting to see how this goes, I noticd in your blog that some of the restrictionin regards to updated data have also been removed which may make if feasible moving forward, providing the overhead isnt too great.

I think I need to download and install a copy at some point to have a dive around.

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