Which One is Better? IN or BETWEEN?
I just had an interesting case of performance tuning: a query with multiple predicates on a very large table. Something...
2018-03-21 (first published: 2018-03-09)
4,120 reads
Superman
Use Filtered Statistics to Improve Performance on Very Large Tables
Let’s say you have a very large table on a SQL Server 2012 Standard Edition instance. This means: old cardinality...
2018-03-02
374 reads
What is the CXPACKET Wait Type?
This wait type indicates that parallel plans execute on the server. This wait type doesn’t necessarily means there is a...
2018-03-02
820 reads
How to Troubleshoot Waiting Tasks Without Requests in SQL Server?
Usually, when I need to troubleshoot currently running requests, I use a combination of sys.dm_exec_requests and sys.dm_os_waiting_tasks. The former retrieves...
2018-02-01
479 reads
Doing More with Less – My Productivity Guide
Houston, We Have a Problem
We are living in a crazy world. And it just gets more and more crazy all...
2018-01-28
836 reads
How to Size Your Database Files?
Let’s say you need to create a new SQL Server database, which is going to grow very fast, but you...
2018-01-18 (first published: 2018-01-08)
1,752 reads
What is Graph Processing in SQL Server 2017?
There is a growing need for Graph Databases in the market. This is a type of database, which is capable...
2018-01-08
538 reads
What is the Automatic Plan Correction in SQL Server 2017?
SQL Server 2017 brings a new interesting feature, that might be a game changer in some environments. I’m talking about...
2017-12-25
563 reads
SQL Saturday Nepal 2017
I had the honor to visit Nepal and participate in SQL Saturday Nepal 2017. You can visit the event website...
2017-12-23
474 reads
How to Calculate Running Totals in SQL Server
In show #84 of the SQL Server Radio Hebrew Edition, Matan and I talked about how to calculate running totals in SQL...
2017-12-01 (first published: 2017-11-19)
2,869 reads
Blogs
Time to Revive our YouTube Channel
It’s been forgotten about and neglected for few years but I’ve decided to dust...
Microsoft MVP 2025: Continuing the Data Platform Journey
I am honored to announce that I have been renewed as a Microsoft MVP...
What is KTLO? Keep The Lights On vs Project Work in Agile
By Rohit Garg
🔍 Demystifying KTLO: A Deep Dive into Keep The Lights On Work in IT...
Forums
How a Legacy Logic Choked SQL Server in a 30-Year-Old Factory
Comments posted to this topic are about the item How a Legacy Logic Choked...
Navigating Multi Platform Realities in My Database Life
Comments posted to this topic are about the item Navigating Multi Platform Realities in...
Import/Export SSMS Settings issue
I have tried a number of times to export and then import my SSMS...
Question of the Day
Query Plan Regressions --
For the Question of the day, I am going to go deep, but try to be more clear, as I feel like I didn't give enough info last time, leading folks to guess the wrong answer... :) For today's question: You’re troubleshooting a performance issue on a critical stored procedure. You notice that a previously efficient query now performs a full table scan instead of an index seek. Upon investigating, you find that an NVARCHAR parameter is being compared to a VARCHAR column in the WHERE clause. What is the most likely cause of the query plan regression?
See possible answers