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How can l optimize my SQL
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00426052
Message ID:
00426134
Vues:
32
>>Also make sure that you have a deleted() index.
>
>http://support.microsoft.com/support/kb/articles/q248/6/08.asp

It is usually better for performance not to create a DELETED() tag, even though it causes the query to be only partially optimized if SET DELETED is ON. The reason for this behavior is that if you are operating over a network and few records are deleted, bringing the DELETED() tag over the wire can take a non-negligible amount of time for very little gain when compared to just testing the deleted status of the fewer records in the result set.
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