Tim Chapman

SQL Server Dedicated Support Engineer (PFE)

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  • Blog Post: Visualizing Index Fragmenation

    We all probably realize that fragmentation can be a performance hindrance, especially for scanning operations. But, what does fragmentation really mean? What does it look like? I've been doing a lot of training for customers lately in terms of fragmentation so I wanted to do a blog post and dig a bit...
  • Blog Post: Index Rebuild vs Reorganize: The transaction log edition

    Recently a friend and fellow PFE Dave Levy ( Twitter / Blog ) and I were discussing a question someone posted in a forum. The question was in regards to database mirroring latency when a reorganization occurs. Dave mentioned that he has seen in the past that switching from performing a reorganization...
  • Blog Post: The Joys of Filtered Indexes

    A filtered index, introduced in SQL Server 2008, is a non-clustered index that contains only a subset of the number of rows contained in a table. Because there is a 1:1 ratio between the number of rows in a table and the number of rows in a regular non-clustered index, a filtered index can have performance...
  • Blog Post: The Pains of Filtered Indexes

    In a previous post I briefly went over how useful filtered indexes can be. Filtered indexes are a great feature that have numerous uses. However, like almost everything in computing, there are trade-offs, and filtered indexes are no exception. The challenge with filtered indexes is the decisions that...
  • Blog Post: How to Parse DBCC MEMORYSTATUS via Powershell

    SQL Server has many ways to dig deep into diagnosing memory related problems. Today it is common to use Dynamic Management Objects (views/functions) to expose a large portion of this information. However, some useful data isn't consumable by DMVs, so we must use DBCC MEMORYSTATUS to get what we need...
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