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Performance: BITMAP index vs. Non-Bitmap Index

From: <antonberg1_at_gmx.de>
Date: 18 Apr 2006 12:44:31 -0700
Message-ID: <1145389470.950383.219310@j33g2000cwa.googlegroups.com> 





Hi,



in the explain plan of an sql-statement I have the following part:
BITMAP CONVERSION TO ROWIDS



and then a Bitmap-Index is used.



Now, I deleted the Bitmap-Option from this index and the sql-statements
are performing much better. They only need 20% of the time, when using
a Bitmaped index.



What could be the reason for this? The conversion?



Thanks for your help,


Anton
Received on Tue Apr 18 2006 - 14:44:31 CDT












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