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Help Optimizing a query
Message
De
18/08/2001 01:28:09
Walter Meester
HoogkarspelPays-Bas
 
 
À
17/08/2001 12:04:35
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00542086
Message ID:
00545801
Vues:
13
Hi Dan,

>I think I've finally found the answer. This Select is actually a drill down from another summary table. I've managed to pre-digest the table so that each drilldown corresponds to a single value which I place in a one character field called RampCode. I've simplified somewhat, but basically, using Walter's COPY idea the final code looks like this.
>
>
>
>Select RampDrillDown
>Set Order To RampCode
>Seek "1"
>
>COPY FIELDS Ramp, Vendor, VendCity, VendSt, HourCount ;
>     TO tRampDrillDown ;
>     WHILE RampCode="1" NoOptimize
>
>
>
>The NoOptimize is the key. Without the NoOptimize, this same COPY takes about 20 to 25 seconds. In this case, for whatever reason, optimization fails.

I'm afraid, i don't understand. The WHILE clause should prevent optimization at forehand so adding the NOOPTIMIZE clause should not make a difference. How long does it take with the NOOPTIMIZE clause. Please give me more information about your solution; I'd really like to know whats going on here.

Walter,
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