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Problem with the optimization
Message
De
16/12/2006 23:07:01
Neil Mc Donald
Cencom Systems P/L
The Sun, Australie
 
 
À
16/12/2006 14:32:08
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Database:
Visual FoxPro
Divers
Thread ID:
01178287
Message ID:
01178359
Vues:
22
Hi,
Can you issue ? SYS(3054,12) for both selects and post them.

>I have a weird problem with the optimization and I cannot find what is causing this.
>
>I have a SQL command that is having several INNER JOINs. So, the command is like this:
>
>
>SELECT Member.Numero,Status.Name FROM Member;
> INNER JOIN Status ON Member.NoStatus=Status.Numero;
> WHERE Member.NumeroI=4112;
> ORDER BY 1 ASC
>
>
>The SQL command has been simplified for the example.
>
>If I use the command as is, the result is not optimized. I could take like 1 to 3 seconds to obtain the result. I can see sometime the progress bar showing the progress or if under a second, I can see something like 0.94, 0.92, etc.
>
>But, if I change one field in the SQL, like this:
>
>
>SELECT Member.Numero,Status.Numero FROM Member;
> INNER JOIN Status ON Member.NoStatus=Status.Numero;
> WHERE Member.NumeroI=4112;
> ORDER BY 1 ASC
>
>
>The result is fully optimized. I get the result in 0.00 second.
>
>So, why changing the field from Status.Name to Status.Numero would cause such a reaction?
Regards N Mc Donald
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