A blog by Jose Barreto, a member of the File Server team at Microsoft.
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Here are some notes on "SQL Server 2008 Fragmentation" I took while attending an advanced class on SQL Server taught by Paul Randal http://sqlskills.com/AboutPaulSRandal.asp).
Please note that, although these notes were taken during the class, I might have added some of my own (mis)interpretation :-). Always check your facts on Books Online (I try to provide links when applicable). As with anything else you get from a blog, never use any of this in production before you thoroughly validate it a test environment. Please keep in mind that some of those will be hard to follow without the right pre-requisite knowledge and the right context. Reading the post from top to bottom will help.
Types of searches
Allocation Order Scan
When to do something about it
Things that cause fragmentation
Symptoms of at Fragmentation
Looking at Fragmentation
Online Index Rebuild
Reorganize Phase 1 - Page compaction
Reorganize Phase 2 - Page defragment
SQL Server Best Practices Article - Predeployment I/O Best Practiceshttp://technet.microsoft.com/en-us/library/cc966412.aspx
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