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Query Processor | Dmitry Pilugin's Notes

Dmitry Pilugin's Notes. April 15, 2015. 251 Posted in query plan. Most of the people knows about the so-called Parameter Sniffing . This topic was discussed in many aspects in a number of great articles. It is interesting that not only parameters might be sniffed during the first execution, but also a runtime constant functions. Let’s look at the example. Few Outer Rows Optimization. April 6, 2015. 251 Posted in Nested Loops. Batch Sort and Nested Loops. April 1, 2015. 251 Posted in join. March 20, 2015.

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Query Processor | Dmitry Pilugin's Notes | queryprocessor.com Reviews
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Dmitry Pilugin's Notes. April 15, 2015. 251 Posted in query plan. Most of the people knows about the so-called Parameter Sniffing . This topic was discussed in many aspects in a number of great articles. It is interesting that not only parameters might be sniffed during the first execution, but also a runtime constant functions. Let’s look at the example. Few Outer Rows Optimization. April 6, 2015. 251 Posted in Nested Loops. Batch Sort and Nested Loops. April 1, 2015. 251 Posted in join. March 20, 2015.
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10 query execution
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Query Processor | Dmitry Pilugin's Notes | queryprocessor.com Reviews

https://queryprocessor.com

Dmitry Pilugin's Notes. April 15, 2015. 251 Posted in query plan. Most of the people knows about the so-called Parameter Sniffing . This topic was discussed in many aspects in a number of great articles. It is interesting that not only parameters might be sniffed during the first execution, but also a runtime constant functions. Let’s look at the example. Few Outer Rows Optimization. April 6, 2015. 251 Posted in Nested Loops. Batch Sort and Nested Loops. April 1, 2015. 251 Posted in join. March 20, 2015.

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Query Processor | Partitioned clustered index and FORCESCAN bug

http://www.queryprocessor.com/partitioned-clustered-index-and-forcescan-bug

Dmitry Pilugin's Notes. Partitioned clustered index and FORCESCAN bug. Partitioned clustered index and FORCESCAN bug. February 17, 2015. 251 Posted in bug. I would like to share one curios case that I recently came across. This bug may lead to incorrect results if you use a partitioned table and the FORCESCAN hint. Consider the following example, lets keep it simple. The following script creates partition function that has 4 ranges. Range 1 – (,0]. Range 2 – (0,10]. Range 3 – (10,100]. You may observe tw...

2

Query Processor | Author Archives

http://www.queryprocessor.com/author/somewheresomehow

Dmitry Pilugin's Notes. Raquo; Articles posted by SomewhereSomehow. July 22, 2016. 251 Posted in cardinality estimation. In this post we continue looking at the Cardinality Estimator (CE). The article explores some join estimation algorithms in the details, however this is not a comprehensive join estimation analysis, the goal of this article is to give a reader a flavor of join estimation in SQL Server. Query Plan on a Busy Server. February 18, 2016. 251 Posted in memory. Reason for early termination.

3

Query Processor | Filtered Stats and CE Model Variation

http://www.queryprocessor.com/ce_filteredstats

Dmitry Pilugin's Notes. Raquo; cardinality estimation. Filtered Stats and CE Model Variation. Filtered Stats and CE Model Variation. May 4, 2014. 251 Posted in cardinality estimation. In this blog post we are going to view some interesting model variation, that I’ve found while exploring the new CE. Today we are going to view some interesting model variation, that creates filtered statistics on-the fly. I should give a disclaimer here. Select count big(*) from Sales.Customer c join Person.Person ...The j...

4

Query Processor | Join Containment Assumption and CE Model Variation

http://www.queryprocessor.com/ce_join_base_containment_assumption

Dmitry Pilugin's Notes. Raquo; cardinality estimation. Join Containment Assumption and CE Model Variation. Join Containment Assumption and CE Model Variation. May 4, 2014. 251 Posted in cardinality estimation. In this post we are going to talk about the one of the model assumptions, that was changed in the new cardinality estimation mechanism in SQL Server 2014 – Join Containment Assumption. Optimizing Your Query Plans with the SQL Server 2014 Cardinality Estimator. However, the estimates are different.

5

Query Processor | Cardinality Estimation Role

http://www.queryprocessor.com/ce_role

Dmitry Pilugin's Notes. Raquo; cardinality estimation. May 1, 2014. 251 Posted in cardinality estimation. This post opens a series of blog posts dedicated to my observations of the new cardinality estimator in SQL Server 2014. But, before we jump to the new features, I’d like to provide some background, to make the next posts clearer. We’ll start by discussing the role of Cardinality Estimation in SQL Server, trying to answer – what is it and why it is needed. Depending on the estimated number of rows (e...

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SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/sql-saturday-178-moscow-inside-query-optimizer

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). SQL Saturday #178 Moscow Inside Query Optimizer. SQL Saturday #178 Moscow Inside Query Optimizer. Published on 19.11.2012. In SQL Server (все заметки). Всем добрый день, как и обещал, выкладываю материалы своего доклада на SQL Saturday. Выражаю благодарность всем организаторам, на мой взгляд все прошло хорошо (несмотря на проверку пожарной безопасности =) . И самое главное, спасибо всем пришедшим, без вас ничего бы не получилось!

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SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/queryruleoff

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). Оптимизатор (недокументированное): Отключить правила преобразования в отдельном запросе. Оптимизатор (недокументированное): Отключить правила преобразования в отдельном запросе. Published on 29.05.2012. In SQL Server (все заметки). Те, кто не знают про правила преобразования, но интересуются, могут обратиться к моему предыдущему циклу заметок, части Оптимизатор (ч.2): Optimization: Trivial Plan Optimization. Use tempdb; go create table t1(a i...

somewheresomehow.ru somewheresomehow.ru

SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/optimizer-part-2-trivial-plan-optimization

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). Оптимизатор (ч.2): Optimization: Trivial Plan Optimization. Оптимизатор (ч.2): Optimization: Trivial Plan Optimization. Published on 27.03.2012. In SQL Server (все заметки). Optimization: Trivial Plan Optimization. Применение правил преобразования;. 8212; особенности стадии trivial plan;. 8212; почему загружается статистика;. 8212; как пропустить фазу поиска тривиального плана (upd). Все правила, можно условно разделить на три группы:. Можно ...

somewheresomehow.ru somewheresomehow.ru

SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/rowgoal-on-non-uniform-distribution

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). RowGoal и неравномерное распределенных данных. RowGoal и неравномерное распределенных данных. Published on 02.07.2012. In SQL Server (все заметки). На написание этой заметки меня подвиг доклад Алексея Эксаревского на 24 hours of PASS про наиболее часты причины ошибок в оценке кардинальности. Те, кто не видел этот доклад могут ознакомиться с ним на techdays. Но на всякий случай повторюсь, чтобы было понятно, о чем речь. Кроме того, создадим ин...

somewheresomehow.ru somewheresomehow.ru

SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/optimizer-part-1-simplification

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). Оптимизатор (ч.1): Введение, Optimization: Simplification. Оптимизатор (ч.1): Введение, Optimization: Simplification. Published on 27.03.2012. In SQL Server (все заметки). 8212; обзор;. 8212; упрощение, исключение противоречий и лишних соединений;. 8212; просмотр дерева логических операций;. Процесс оптимизации состоит из следующих шагов. 32 Trivial Plan Optimization. На этапе связывания, производится разрешение имен, проверка на существовани...

somewheresomehow.ru somewheresomehow.ru

SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/optimizer_unleashed_2

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). Оптимизатор без границ (ч.2). Оптимизатор без границ (ч.2). Published on 10.12.2012. In SQL Server (все заметки). Продолжаем отключать внутренние пороги оптимизатора. В первой части были приведены общие теоретические сведения (на которые я буду ссылаться, по этому, рекомендую их просмотреть, если еще не успели), а так же представлен флаг трассировки 8780 который устанавливает timeout в очень большое число, фактически отключая его. Согласно ал...

somewheresomehow.ru somewheresomehow.ru

SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/dbcc-csindex

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). Недокументированная команда dbcc csindex. Недокументированная команда dbcc csindex. Published on 28.02.2013. In SQL Server (все заметки). По мере подготовки докладов на тему Columnstore индексов наткнулся на интересную недокументированную команду dbcc csindex. Никакой информации по ней нашел, по этому поделюсь тем что удалось выяснить самому. Использовать можно следующим образом, например, создадим таблицу с колоночным индексом. Можно заметит...

somewheresomehow.ru somewheresomehow.ru

SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/good-enough-plan

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). Published on 10.12.2013. In SQL Server (все заметки). Когда-то, я уже писал заметки. Время выполнения запроса на машине Ника в 1 секунду. Оттуда же пошли некоторые константы, например случайный доступ 320 операций в секунду породил константу 1/320 = 0.003125, которая и по сей день зашита внутри сервера и используется для оценки стоимости операции случайного доступа. Но, вернемся к тому, что первоначально, стоимость 1 отражала оценку предполаг...

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SomewhereSomehow's SQL Server notes - Главная

http://www.somewheresomehow.ru/24-hop-columnstore-indexes

SomewhereSomehow's SQL Server notes. SQL Server (все заметки). 24 HOP Columnstore Indexes. 24 HOP Columnstore Indexes. Published on 22.03.2013. In SQL Server (все заметки). Вот и прошла глобальная on-line конференция 24 Hours of PASS Russia. В этом году, я первый раз принимал в ней участие в качестве докладчика, выступая с докладом про новую технологию Columnstore Indexes в SQL Server 2012. Как и обещал, выкладываю свои материалы к конференции, презентацию и демонстрации. 24HOP2013 Columnstore ( 433 KB).

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Query Processor | Dmitry Pilugin's Notes

Dmitry Pilugin's Notes. April 15, 2015. 251 Posted in query plan. Most of the people knows about the so-called Parameter Sniffing . This topic was discussed in many aspects in a number of great articles. It is interesting that not only parameters might be sniffed during the first execution, but also a runtime constant functions. Let’s look at the example. Few Outer Rows Optimization. April 6, 2015. 251 Posted in Nested Loops. Batch Sort and Nested Loops. April 1, 2015. 251 Posted in join. March 20, 2015.

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