Category: Performance Tuning

Query to find Nonclustered Index clashing with Clustered Index

It's being quite a long time when I made the last post. Actually, I was lacking a topic that should trigger me to write. Finally, I got one when I was working on one of the Performance Tuning assignments. Performance Tuning is a mix of wisdom and exploring the unknown, especially when you have a … Continue reading Query to find Nonclustered Index clashing with Clustered Index →

Query to list all the procedures and triggers not having SET NOCOUNT ON defined

It is a tiny query in size but can play a crucial role to avoid overhead, caused due to missing SET NOCOUNT ON definition in the stored procedures and triggers. Read more about SET NOCOUNT here. Here are few useful articles talking about why it's important to add SET NOCOUNT ON. SET NOCOUNT ON Improves … Continue reading Query to list all the procedures and triggers not having SET NOCOUNT ON defined →

Game changer settings # MAXDOP and Cost threshold for parallelism

I got a performance tuning assignment for an esteemed customer in the Financial Services domain. I went through the wait stats of SQL Server using the built-in SQL Server Report, called Performance Dashboard. I found CPU – Parallelism referred to as CXPACKET was leading the list, followed by Buffer IO, Lock, and Latch. Parallelism in SQL Server refers to two settings – MAXDOP and Cost threshold … Continue reading Game changer settings # MAXDOP and Cost threshold for parallelism →

Tracking costliest queries

Being a Database Developer or Administrator, often we work on Performance Optimization of the queries and procedures. It becomes very necessary that we focus on the right queries to get major benefits. Recently I was working on a Performance Tuning project. I started working based on query list provided by client. Client was referring the … Continue reading Tracking costliest queries →

Probing Columnstore Indexes

This article was first published on: 2020-03-14. This article will probe the performance benefits of columnstore indexes, on a transactional (OLTP) workload for real-time analytics. We'll cover examples from each of the followings - Pivot, Aggregate Functions, Analytic Functions, Ranking Functions and Window Functions.