All Articles - SQL Authority with Pinal Dave

How Much Work Each Processor (CPU) is Doing in SQL Server? – Interview Question of the Week #178

June 17, 2018

SQL CPU, SQL DMV, SQL Scripts, SQL Server

Question: How Much Work Each Processor (CPU) is Doing in SQL Server?

Answer: To be honest, I have not seen this question asked in any of the interview questions so far. Actually, this question was asked by one of my clients during Comprehensive Database Performance Health Check. Every time whenever he logs into his system, he finds his CPU running very very high even though he had over 56 active processors. What he really wanted to know what exactly is going on behind the scene of his processors. He really wanted to figure out, how busy his servers are and how much work is pending per Processor (CPU)?

SQL SERVER – Adding Values WITH OVER and PARTITION BY

June 16, 2018

Pinal Dave

SQL Tips and Tricks

Ranking Functions, SQL Function, SQL Order By, SQL Scripts, SQL Server

Once in a while, I get questions where users have indeed explained the question well enough that I can easily understand their question. If I understand question quickly, I am always able to answer it efficiently as well. In this blog post, we will see one such question which I answered with keywords WITH OVER and PARTITION BY.

SQL SERVER – Optimal Value Max Worker Threads

June 15, 2018

Pinal Dave

SQL Performance

SQL CPU, SQL DMV, SQL Server

During Comprehensive Database Performance Health Check, one of the DBas asked what is the most optimal value for Max Worker Threads. The question was indeed asked when my customer looked at the value of Max Worker Threads in the Processor sections of the Server Property, they were really worried. The default value of the Max Worker Threads is always set to zero.

SQL SERVER – How to DELETE Multiple Table Together Via SQL Server Management Studio (SSMS)?

June 14, 2018

Pinal Dave

SQL Tips and Tricks

SQL Scripts, SQL Server, SQL Server Management Studio, SSMS

Question: How to DELETE Multiple Table Together Via SQL Server Management Studio (SSMS)?

SQL SERVER – Performance Comparison IN vs OR

June 13, 2018

Pinal Dave

SQL Performance

SQL Function, SQL Operator, SQL Server

Some questions never get old and some question and I believe we will be discussing them for many more years in the future. Just other days, I received this question during my SQL Server Performance Tuning Practical Workshop. The question was about Performance Comparison IN vs OR. Though personally, I have answered this question quite a many times before, let us answer it once again, it never hurts to repeat the truth multiple times.

SQL SERVER – SSMS 17.7 Observation – Two Miscellaneous Category in Database Property Options

June 12, 2018

Pinal Dave

SQL Puzzle

Bug, SQL Server, SQL Server Management Studio, SSMS

First of all this observation is only applicable if you are using SSMS 17.7 build. It was very interesting to me that I was able to find two Miscellaneous categories in Database Property Option for SQL Server. Please note the version of SQL Server which I have connected to SSMS 17.7 is also SQL Server 2017. If you try following on any other SSMS version you may not get the same results.

SQL SERVER – How to Fix CONVERT_IMPLICIT Warnings?

June 11, 2018

Pinal Dave

SQL Performance

SQL Function, SQL Scripts, SQL Server

One of the biggest issues I see with at various of my customer who signed up at Comprehensive Database Performance Health Check, is about CONVERT_IMPLICIT. As soon as I demonstrate my customer that they are not getting performance due to CONVERT_IMPLICIT their next question is how can they fix the issue of CONVERT_IMPLICIT. In this single blog post, we will learn about how to find this issue and fix it as well.

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How to Find Cardinality or Uniqueness for any Column? – Interview Question of the Week #177

June 10, 2018

Pinal Dave

SQL Interview Questions and Answers

SQL Index, SQL Performance, SQL Scripts, SQL Server

Question: How to Find Cardinality or Uniqueness for any Column?

SQL SERVER – Script to Identify Memory Used By Each Database

June 9, 2018

Pinal Dave

SQL Tips and Tricks

SQL Memory, SQL Scripts, SQL Server

During the last SQL Server Performance Tuning Practical Workshop, I was asked a very interesting question by an attendee. The question goes like if there is any script available which users can use and figure out if how much memory used by each of the databases. Fortunately, I was lucky that I have a script handy which exactly does the same task.

SQL SERVER – Install Error: Microsoft Cluster Service (MSCS) Cluster Verification Errors – Part 3

June 8, 2018

Pinal Dave

SQL

AlwaysOn, SQL Error Messages, SQL Server, SQL Server Cluster

In recent past, I was assisting a client in installing SQL Server clustered instance in a Windows Cluster. There were many errors encountered and I learned a lot from this experience. In this blog, we would learn about Microsoft Cluster Service (MSCS) cluster verification errors which might appear during installation or AddNode.