Jeff Moden

  • Interests: SQL. When Im not having fun with that, then SQL. ;-)

SQLServerCentral Article

Hierarchies on Steroids #1: Convert an Adjacency List to Nested Sets

SQL Server MVP Jeff Moden shows us a new very high performance method to convert an "Adjacency List" to “Nested Sets” on a million node hierarchy in less than a minute and 100,000 nodes in just seconds. Not surprisingly, the "steroids" come in a bottle labeled "Tally Table".

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2014-09-19 (first published: )

40,172 reads

SQLServerCentral Article

How to Make Scalar UDFs Run Faster (SQL Spackle)

It's a well known fact that Scalar UDFs are the stuff of performance nightmares in T-SQL. But are they really as bad as they say? SQL Server MVP Jeff Moden shows us that they might not really be as big a problem as you might think and what you can do when they actually are.

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2014-06-24 (first published: )

26,512 reads

SQLServerCentral Article

Tally OH! An Improved SQL 8K “CSV Splitter” Function

The Tally Table has proven to be a simple and elegant method for avoiding many varieties of RBAR. Unfortunately, one of its more common uses, that of a CSV splitter, has a well-known and serious performance problem. MVP Jeff Moden shows us what that problem is and how to correct it. (UPDATED with additional info and attachments on 5/12/2011).

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2012-12-28 (first published: )

136,545 reads

SQLServerCentral Article

Hierarchies on Steroids #2: A Replacement for Nested Sets Calculations

In this sequel to his first "Hierarchies on Steroids" article, SQL Server MVP Jeff Moden shows us how to build a pre-aggregated table that will answer most of the questions that you could ask of a typical hierarchy. Any bets on whether Santa is packin’ a Tally Table in his bag or not?

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2012-11-15

19,173 reads

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Step by step guide to setup PostgreSQL on Docker

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Backing up the Database Encryption Key

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Question of the Day

Backing up the Database Encryption Key

In my SQL Server 2022 database, I run this:

USE Sales;  
GO  
CREATE DATABASE ENCRYPTION KEY  
WITH ALGORITHM = AES_256  
ENCRYPTION BY SERVER CERTIFICATE MyServerCert;  
GO
This works, but I want to prepare for the future and potential issues. How do I back up my DEK?

See possible answers