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Why is it so slow?
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À
15/08/2002 10:10:34
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00689948
Message ID:
00689959
Vues:
18
>Hi
>
>I have a table that contains 192,216 records, 177,493 of these are deleted records.
>
>I have a DELETED() Index on the table, yet when I run a command like SCAN FOR...ENDSCAN on an indexed field, it takes absolutely ages. This is over a 1MB WAN by the way, but it still should only take seconds, it takes minutes, about 3 to be exact.
>
>What am I doing wrong here?
>
>Thanks
>Kev

1. Be sure to have NOT DELETED() (in the FOR clause)
2. Select that index (!)
3. Have SET DELETED ON

But I guess that's all obvious (?)

4. Begin the SCAN with a SEEK (may differ)
5. Have a WHILE in the SCAN (shouldn't differ opposed to the deleted records).
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