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Negative percentage improvement values in Index Tuning?

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NathanGriffiths

NathanGriffiths

Programmer
May 14, 2001
213
NZ
Having run Index Tuning Wizard against our heavliy loaded database, the recommended index configuration appears to give some strange results.

In the Query Cost Report the "percentage improvement in cost" values for the 100 most expensive queries are all large negative values e.g. -96133, -1662

Does this imply an improvement? I thought these values were supposed to be positive so if I apply the recommended index configuration, will this in fact reduce the performance of these queries?

thanks,

Nathan
 
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