Re: Better index stategy for many fields with few values

Hi, Jim,

Jim C. Nasby wrote:

>>>I was also thinking about about using a functional index.
>>If there's a logical relation between those values that they can easily
>>combined, that may be a good alternative.
> How would that be any better than just doing a multi-column index?

10 different values per column, and 20 columns are 10^20 value combinations.

Partitioning it for the first column gives 10^19 combinations which is
smaller than 2^64, and thus fits into a long value.

And I just guess that a 10-partition functional index on a long value
could perform better than a multi-column index on 20 columns of
character(10), if only because it is approx. 1/25th in size.

HTH,
Markus
--
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf. | Software Development GIS

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