predindedic

Naj ti poljub nariše ustnice – SQL Sat Slovenia T-16

In 16 days starts SQL Sat Slovenia conference and I am recalling today an old great song from the Slovenian band "Lačni Franz" in a new, acoustic arrangement. Naj ti poljub nariše ustnice as … [Read More...]

1001

Beyond Statistics Histogram – Part 2 (TF 2390)

In the previous article of this series we introduced the problem with queries using literals which are beyond statistics histogram, but exist in the table. We saw that this can be a serious problem in … [Read More...]

1001

Beyond Statistics Histogram – Part 2 (TF 2390)

In the previous article of this series we introduced the problem with queries using literals which are beyond statistics histogram, but exist in the table. We saw that this can be a serious problem in … [Read More...]

passaustria

PASS Austria Meeting on 30th October

Thanks to those who attended my talk on Thursday evening at Pass Austria Meeting. Click hereto download slide deck, SQL Server code repository templates and applications for genereting an install … [Read More...]

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1001

Beyond Statistics Histogram – Part 2 (TF 2390)

In the previous article of this series we introduced the problem with queries using literals which are beyond statistics histogram, but exist in the table. We saw that this can be a serious problem in large tables in SQL Server 2012. We saw also that SQL Server 2014 handles it better. In this article we’ll […]

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CE

Beyond Statistics Histogram – Part 1

In this article I will start to examine estimations and execution plans for queries that compare values in columns with literal values which are beyond the statistics histogram for that column. The problem is … [Read More...]

9_6

A Funny Bug with New CE or Introduction to Out-of-Histogram Estimations

Since the release of SQL Server 2014 you can find several articles and blog posts about the changes in the new redesigned cardinality estimator. An excellent and detailed guide about the changes in the new CE … [Read More...]

8_8

New Cardinality Estimator Part 8 – Bug No. 2

In this article I will describe another query pattern where new CE in SQL Server 2014 brings significant regression. And, similar to the case in this post I would interpret the behavior of new cardinality … [Read More...]

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