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View performance much greater than SQL equivalent
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De
04/03/2008 14:17:18
 
 
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
View performance much greater than SQL equivalent
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows XP SP2
Network:
Windows 2000 Server
Database:
Visual FoxPro
Divers
Thread ID:
01298569
Message ID:
01298569
Vues:
57
1.) I am monitering the network traffic when I open a view versus when I execute the underlying SQL. I find that the SQL SELECT taxes the network <5% while opening the view records under 50%. I get the SQL statement from GENDBC so I am confident that's the view's code. The SELECT statement for the view is:

SELECT ManifestHdr.dManifest, ManifestHdr.lOpen, ManifestHdr.iQty,;
COUNT(ManifestDtl.iPk) AS nScanned, ManifestHdr.iPk,
Manifesthdr.iFkSystems;
FROM SN!ManifestHdr;
LEFT OUTER JOIN SN!ManifestGrp;
ON ManifestGrp.iFkManHdr = ManifestHdr.iPk;
LEFT OUTER JOIN SN!ManifestDtl;
ON ManifestDtl.iFkManGrp = ManifestGrp.iPk;
WHERE ManifestHdr.iFkSystems = ?vp_ManifestHdr_iFkSystems;
GROUP BY ManifestHdr.iPk;
ORDER BY ManifestHdr.dManifest

Any ideas why this is?
-Malcolm Donald
Accelerant, Inc.
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