Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Does index tag on DELETED() help?
Message
De
07/11/2004 11:47:00
 
 
À
07/11/2004 11:31:43
Jon Neale
Bond International Software
Wootton Bassett, Royaume Uni
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
00958911
Message ID:
00958981
Vues:
20
Hi Jon,

While I feel that an index on DELETED() **did** help performance in FPD, it is quite clear that it is no longer the case in VFP, most especially if only a small percentage of the records are deleted (or none, as is often the case).

If you want a simple way to test this, find a table with lots of records but few/none deleted. Then run your SELECT and time it.
Now delete the TAG for DELETED() on that table and REBOOT.
Once back up, run the same test and time it.

good luck


>Hi Walter,
>
>I have always used the DELETED() index and only once has it caused me a perfoamnce issue. In my opinion (and its just my opinion) its best to set them up but if you do find your are having performance issues then it would be one of the first things I would look at removing.
>
>To be honest I have never had enough time to do any sort of benchmarking with DELTED() set and not set, so maybe I dont have the authority to make any general remarks over it. All I can say is that in my experience it hasnt caused major every day performance problems just occasional exceptions.
>
>Jon
Précédent
Suivant
Répondre
Fil
Voir

Click here to load this message in the networking platform