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nonclustered primary

Nonclustered Primary Key – SQL in Sixty Seconds #119

September 7, 2020
Pinal Dave
SQL Video
Primary Key, SQL Constraint and Keys, SQL in Sixty Seconds, SQL Index, SQL Scripts, SQL Server

I will describe in detail a bit later on during this blog post. Today we are going to learn that it is possible to have a nonclustered primary key. 

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Ash and a remaining ember indicate a recent fire without revealing its complete history

When was Stored Procedure Last Compiled? – Interview Question of the Week #292

September 6, 2020
Pinal Dave
SQL Interview Questions and Answers
SQL Cache, SQL Performance, SQL Scripts, SQL Server, SQL Stored Procedure

Question: When was Stored Procedure Last Compiled?

Answer: Honestly, it is difficult to figure out when was the stored procedure last compiled.

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Gouache painting of a telescope on a harbor wall watching one vermilion sailboat move among anchored boats

Watch a Running Query: Live Plan From Activity Monitor

September 2, 2020
Pinal Dave
SQL Tips and Tricks
Execution Plan, SQL Activity Monitor, SQL DMV, SQL Scripts

To watch a running query, open Activity Monitor in SSMS 22, find the query in Active Expensive Queries, and open its live execution plan. It also shows the settings that older versions need and a T-SQL query that reads the same facts.

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Stock remains visible inside a small shop whose glass door is closed

What Happens If the Clustered Index is Disabled? – Interview Question of the Week #291

August 30, 2020
Pinal Dave
SQL Interview Questions and Answers
Clustered Index, SQL Error Messages, SQL Index, SQL Scripts, SQL Server

Question: What Happens If the Clustered Index is Disabled?

Answer: If you disable the clustered index, you can’t retrieve data from the table.

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Who Dropped

Who Dropped Your Table? – SQL in Sixty Seconds #112

August 28, 2020
Pinal Dave
SQL Video
SQL in Sixty Seconds, SQL Reports, SQL Scripts, SQL Server, SQL Server Security

Who Dropped My Table? – I was recently asked this question in Comprehensive Database Performance Health Check. Let us learn about it today.

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Single Column

Single Column Single Row and TABLE SCAN – SQL in Sixty Seconds #111

August 27, 2020
Pinal Dave
SQL Video
Execution Plan, SQL in Sixty Seconds, SQL Operator, SQL Performance, SQL Scripts, SQL Server

Can a single column and single row result do an entire table scan? I recently got this question in my  Comprehensive Database Performance Health Check.

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WITH NOLOCK

Dirty Read with NOLOCK – SQL in Sixty Seconds #110

August 26, 2020
Pinal Dave
SQL Video
SQL in Sixty Seconds, SQL Performance, SQL Scripts, SQL Server, Transaction Isolation

Recently I noticed that my client has been using the WITH NOLOCK hint with their queries and expecting that it will improve the queries performance.

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