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Q.: Understanding Rushmore Technology
Message
De
25/08/1999 19:17:43
 
 
À
25/08/1999 10:53:21
Pierre Richard
Méthotech Canada Limitée
Kirkland, Québec, Canada
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00257424
Message ID:
00257695
Vues:
26
>Hi all,
>
>The VFP 5.0 Developer's Guide states at page 396, parag. 5, " Avoid using indexes on fields that contain only a few discrete values such as a logical field"
>

Focussing on the first half of Mr. Richard's observation (quoted above), I would like to ask UT folks:

Where is the dividing line?

In other words how many is "few"?

After I read the FPA article (subtitled "Less is more" right?), I took out some of my indexes. Now I'm about to go back and take out many more to see if I can speed up saves which are too slow without severely impacting queries.

I working with a WAG of "ten or fewer different values". For instance, I have a one byte reservation status field which contains only the values: D, A, N, R, I, O, and C. My WAG rule tells me: No Index.

What say you all?

Peter Robinson
Peter Robinson ** Rodes Design ** Virginia
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