Question of the Day Sixteen

Let us continue our question of the day series with day sixteen.

What is index fragmentation ?

Index fragmentation occurs as records are added, deleted or updated over time.  As data on a page fills the page, a page split occurs moving half of the data to a new page created after all of the other pages in the table.  As you can see, when the engine is searching for data it must bounce around the pages instead of moving along contiguous pages.  As the level of fragmentation rises, query performance will degrade considerably so regular maintenance is a good idea.

Enjoy!

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About SQLGator

Florida Gator and Microsoft Data Platform MVP, Star Wars fanatic and is there anything else...oh yeah PS4! I am a geek and SQL Server DBA who dabbles with VMWare, there are other technologies greater than these? Not so fast my friend! I also love to travel to new and exotic places.

Posted on August 18, 2012, in SQL Schoolhouse and tagged . Bookmark the permalink. Leave a comment.

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