Indexes have their disadvantages


	Indexes have their disadvantages

Osolage

6-7-2007 3:09 PM

988 views

tags:

sql server, database administration, performance tuning, indexing

Osolage says:

I've seen a lot of people talk about the consumption of disk space with respect to indexes, but I don't remember seeing mention of how it could consume memory space. I believe that makes sense. And seeing how I'm fighting with memory right now, it makes me think twice about slapping yet another index on my tables.

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 Indexes are used to:
 </P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dotnetjohn.com/articles.aspx?articleid=130"><UL>
 <li style="margin-left:16px;padding-left: 0px;">increase the speed of data access</LI>
 <li style="margin-left:16px;padding-left: 0px;">enforce uniqueness of data</LI>
 </UL></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.dotnetjohn.com/articles.aspx?articleid=130"><P>
 However, they have their disadvantages. Firstly, they consume a lot of disk and memory space. Each time you 
 create an index it will store all index keys, ordered in ascending or descending order; the larger the key, the 
 bigger the index. Secondly, they cause slower inserts and may cause slower updates and deletes, though not 
 necessarily.
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