Index Bloat - how to tell?

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How can you tell when your indexes are starting to get bloated and when you need to rebuild them.  I haven't seen a quick way to tell and not sure if it's being tracked.

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| John W. Strange | Investment Bank | Global Commodities Technology 
| J.P. Morgan | 700 Louisiana, 11th Floor | T: 713-236-4122 | C: 281-744-6476 | F: 713 236-3333
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