Brian Kelley

Brian Kelley is an author, columnist, and Microsoft SQL Server MVP focusing primarily on SQL Server security. He is a contributing author for How to Cheat at Securing SQL Server 2005 (Syngress), Professional SQL Server 2008 Administration (Wrox), and Introduction to SQL Server (Texas Publishing). Brian currently serves as an infrastructure and security architect. He has also served as a senior Microsoft SQL Server DBA, database architect, developer, and incident response team lead.
  • Interests: Chess, Reading, Soccer (Football), Baseball, Animals, Theology

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Blogs

Copying an Azure SQL database between two Azure SQL Instances in two different subscriptions.

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I recently had to copy an Azure SQL database (SQL db) from one subscription...

A field note: AI Ambition vs. Operational Reality in 2025

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Ivan Jelić, Group CEO at Joyful Craftsmen, reflects on what separates AI success from...

Redefining Tech Leadership in the Age of Microsoft AI

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AI is no longer a niche capability – it is a leadership catalyst. As...

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Forums

How a Legacy Logic Choked SQL Server in a 30-Year-Old Factory

By Chandan Shukla

Comments posted to this topic are about the item How a Legacy Logic Choked...

SQL Server Columnstore Index Fragmentation

By Grant Fritchey

Comments posted to this topic are about the item SQL Server Columnstore Index Fragmentation

do i lose "what this object depends on" etc when moving sprocs to etl server

By stan

Hi i was surprised to see the approach my coworkers used to sunset talend...

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Question of the Day

SQL Server Columnstore Index Fragmentation

The columnstore index is absolutely different than the traditional rowstore b-tree index. Because of this, it doesn't suffer from the same kind of fragmentation across pages as the b-tree index. Yet, it does suffer from a type of fragmentation brought about by an excess of deleted rows in a rowgroup and a lack of compression of storage because more things are in the delta store. While b-tree indexes use dm_db_index_physical_stats to show fragmentation, which system tables or DMVs can be used in SQL Server (prior to SQL Server 2025) to determine columnstore fragmentation?

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