Kalen Delaney

Kalen
Delaney

Kalen Delaney has been working with SQL Server for over 26 years and provides SQL Server training and consulting to clients around the world. Her most recent book is SQL Server 2012 Internals (Microsoft Press).

Articles
cool written in ice
Cool New SQL Server 2012 Metadata 1
SQL Server 2012 includes a new undocumented DMV which is actually a function that returns one row for each page, just like DBCC IND. However, because it's a DMV, it returns tabular data, and it can queriered just like a table.
hand with pen tracking red and green graph
IAMs: Keeping Track of Space Used 2
Every SQL table and index has at least one Index Allocation Map (IAM). Learn more about IAMs and how much space is actually allocated to a SQL Server table.
SQL Server’s Undocumented Changes
The DBCC IND command is available in SQL Server 2012 and is still undocumented, but in SQL Server 2012 there's a replacement to DBCC IND that’s even more useful.
SQL Server 2012 Released Concurrently with Launch Events
Unlike the documentation for previous SQL Server versions, the documentation downloads don't seem to be available as a standalone app. You have to have SQL Server 2012 already installed.
More Small Code Changes, Bigger SQL Server Performance Improvements 1
Kalen Delaney offers an expert tip about a simple code change that can be made to search arguments (SARGs) to improve SQL Server performance.
sql server code and databases
Small Code Changes, Big SQL Server Performance Improvements 7
Learn how you can replace a scalar-valued user-defined functions (UDFs) call with actual code to greatly improve SQL Server performance.
business people looking serious around table
Take a Hint About Query Hints
Kalen discusses two reasons she finds SQL Server query hints to be fascinating.
What Do You Want to Know About SQL Server 2012? 2
Kalen Delaney asks which SQL Server 2012 features you want to learn about and how in-depth you'd like the coverage to be.
PASS Summit 2011 Highlights
A look back at PASS Summit 2011, including how the #sqlpass hashtag grew excitement for the event, how first time attendees felt about their first PASS Summit, differences between sessions, and more.
Pros and Cons written on hands with clouds and sky in background
The Pros and Cons of Parameter Sniffing
A look at the pros and cons of parameter sniffing, locked data, table scans, and query recompilation.
SQL Server Training: More Options Than Ever Before 3
Kalen Delaney explores SQL Server training options, including online training, in-person training, and hybrid approaches.
The New Kid in Town: SQL Server Denali 5
Kalen explores SQL Server Denali's future name, installation process, and commands that have been deprecated.
heavy load sign in brown
Testing a Heavy Load: Simulating Multiple Concurrent Operations 1
It is necessary to test your database application performance with many concurrent operations to simulate multiuser environments. Here's some suggestions for how to do so.
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Spring Cleaning with SQL Server Stored Procedures
While browsing SQL Server’s documentation recently, I found two stored procedures for removing ghost records: sp_clean_db_free_space and sp_clean_db_file_free_space.
Do You Need a SQL Server Query Hint? 3
Find out how query hints can benefit you in certain situations and how the hints affect SQL Server's built-in query optimizer.

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From the Blogs
Aug 27, 2015
blog

A Replacement for Maintenance Plan Backups

This blog post is a bit of a ‘repeat’ – since I already covered much of the rationale behind this post in Part 23 of my multi-part series on AlwaysOn Availability Groups and SQL Server Agent Jobs. But, I also figured that this is enough of an important topic to merit its own blog post....More
Aug 19, 2015
blog

Looking forward to Containers

Virtualization has long been a staple when it comes to computing. In essence, virtualization is really just the use of abstraction to make things either easier to manage or more fault-tolerant. Disks, for example, have long been virtualized in the sense that a single, physical, can easily be divided up into multiple logical (or virtual) volumes (or drives) just as easily as a number of discreet physical disks can also be virtualized into a single drive (via RAID) – which can further be partitioned into volumes, LUNs, and so....More
Jul 28, 2015
blog

AlwaysOn Availability Groups and SQL Server Jobs, Part 29: Practical Implementation Tips

My initial goal in writing this series of posts was to outline some of the concerns surrounding Availability Groups (AGs) and SQL Server Agent Jobs – and call out how there is virtually no guidance from Microsoft on this front and then detail some of the pitfalls and options available for tackling this problem domain. I initially expected this series of posts to have between 25 and 30 posts – according to some of the early outlines I created ‘way back when’....More
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