Kalen Delaney

Kalen Delaney has been working with SQL Server for over 30 years, and is one of the world's most respected authorities on SQL Server and a much sought after trainer and speaker. Her book on "SQL Server Internals" is consistently cited as a must-read for aspiring SQL Server professionals.

In-Memory OLTP eBook Download

SQL Server Internals: In-Memory OLTP

In this book, Kalen Delaney explains how the 2016 In-Memory OLTP engine works, how it stores and manipulates data, and how, even with all data stored in memory and no locking or latching, it can still guarantee the ACID properties of all transactions.

(1)

You rated this post out of 5. Change rating

2023-04-24 (first published: )

1,033 reads

SQLServerCentral Article

SQL Server Concurrency: Locking, Blocking and Row Versioning

Your application can have impeachable indexes and queries, but they won't help you if you can't get to your data because another application has it locked. That's why every DBA and developer must understand SQL Server concurrency and how to troubleshoot excessive blocking or deadlocking. Kalen Delaney's book is your guide.

(2)

You rated this post out of 5. Change rating

2013-08-26

5,213 reads

SQL Server Concurrency eBook cover

SQL Server Concurrency: Locking, Blocking and Row Versioning

Your application can have impeachable indexes and queries, but they won't help you if you can't get to your data because another application has it locked. That's why every DBA and developer must understand SQL Server concurrency and how to troubleshoot excessive blocking or deadlocking. Kalen Delaney's book is your guide.

You rated this post out of 5. Change rating

2012-10-02

3,678 reads

Blogs

KDA: Echoes of Deception - Case 7

By

A fugitive cyber-criminal, a wingsuit, and 24 million flight records. Somewhere between Doha and...

Do This Before You Contact Your SQL Server Consultant

By

Say you need outside help. You’ve exhausted all the things that you could do...

Microsoft MVP 2026: Ten Years on the Data Platform

By

I’m honored to announce that I’ve been renewed as a Microsoft MVP for the...

Read the latest Blogs

Forums

Implicit Conversions Cripple SQL Server

By sabyda

Comments posted to this topic are about the item Implicit Conversions Cripple SQL Server

BIT_COUNT() III

By Steve Jones - SSC Editor

Comments posted to this topic are about the item BIT_COUNT() III

The Mythical Bus Accident

By Steve Jones - SSC Editor

Comments posted to this topic are about the item The Mythical Bus Accident

Visit the forum

Question of the Day

BIT_COUNT() III

In SQL Server 2025, I run this code:

select bit_count(-1)
What is returned?

See possible answers