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11.10.2008 at 05:20AM PST, ID: 23890638
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Determine If an Index Needs to Be Rebuilt

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9.0
Tags:

Oracle, Database, 10g

Hello,

In reading various information on the web there seems to be a great debate over rebuilding standard Oracle indexes( how often and how affective it is etc.).  I have a table that experiences a large number of deletions plus others with not so heavy deletion rates.   I am suspecting that performance may be enhanced if the index is rebuilt but I'd like to be able to determine this a head of time (some systems cannot use ONLINE option and need a maintenance window etc.).

1. How can I determine if an index needs to be rebuilt, i.e. is there a formula that shows efficiency etc.?

2. Can you recommend SQL that can be run to determine indexes that need to be rebuilt?


Thanks,

Michael
 
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