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Carnality Estimation

SQL SERVER – Temp Table vs Table Variable – Cardinality Estimation

January 17, 2020
Pinal Dave
SQL Performance
Cardinality, Execution Plan, SQL Scripts, SQL Server, SQL TempDB, Temp Table

I had a very interesting conversation with one of my clients about Cardinality Estimation for Temp Table vs Table Variable. Let us discuss it today.

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What is TempDB Spill in SQL Server? – Interview Question of the Week #259

January 12, 2020
Pinal Dave
SQL Interview Questions and Answers
Execution Plan, SQL Memory, SQL Scripts, SQL Server, SQL TempDB

When SQL Server uses TempDB when any query does not have enough memory to do its operation, it is called TempDB Spill. Let’s learn today.

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Parameter Sniffing

SQL SERVER – Parameter Sniffing Simplest Example

December 19, 2019
Pinal Dave
SQL Tips and Tricks
Execution Plan, Parameter Sniffing, SQL Scripts, SQL Server, SQL Stored Procedure

Today we will see a very simple example of the Parameter Sniffing. Let us see a very simple example of the parameter sniffing.

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Execution Plan Operator

Why Execution Plan Operator Read More Rows Than Available? – Interview Question of the Week #255

December 15, 2019
Pinal Dave
SQL Interview Questions and Answers
Execution Plan, SQL Performance, SQL Scripts, SQL Server

Question: Why Execution Plan Operator Read More Rows Than Available?

Answer: Statistics.

Now let us learn detailed answer in this blog post.

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With Join

SQL SERVER – Query Without Join Showing Query Plan With Join

December 14, 2019
Pinal Dave
SQL Performance
Execution Plan, Query Hint, SQL Joins, SQL Scripts, SQL Server

This question often keeps on coming in my consulting engagements. Let us quickly see the answer about Query Without Join Showing Query Plan With Join.

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Feedback Disabled

SQL SERVER – Memory Grant Feedback – No Feedback Disabled

November 29, 2019
Pinal Dave
SQL Performance
Execution Plan, Memory Grant, SQL Memory, SQL Scripts, SQL Server

Let us discuss MemoryGrantInfo when the value of the IsMemoryGrantFeedbackAdjusted property displays No Feedback Disabled.

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SQL SERVER – Memory Grant Feedback – MemoryGrantInfo and IsMemoryGrantFeedbackAdjusted

November 28, 2019
Pinal Dave
SQL Performance
Execution Plan, Memory Grant, SQL Memory, SQL Scripts, SQL Server

We will discuss a very interesting topic of Memory Grant Feedback along with MemoryGrantInfo and IsMemoryGrantFeedbackAdjusted in the execution plan. 

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