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SQL optimization
Message
De
26/07/1999 20:49:39
 
 
À
26/07/1999 20:17:04
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00246060
Message ID:
00246395
Vues:
24
Yes, Sylvain, that's a reasonable way to describe it. But we also *now* know that this can (and likely will) SLOW down the Select *despite* the fact that it now shows "fully optimized".

Jim N

>With SET DELETED ON, VFP will secretly add "AND NOT Deleted()" to the WHERE clause of your query at runtime. As with every expression in the WHERE clause, VFP will search for an index that match the expression.
>
>>I don't understand it, but it sure worked. I indexed on DELETED() and
>>all of a sudden I'm getting full optimization. I *will* be asking
>>somebody (pro'ly Kevin Levy) about this in Costa Mesa! :-)
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