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Compare speed of SQL Select
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À
16/09/2020 13:11:14
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01676140
Message ID:
01676153
Vues:
44
>>Hi,
>>
>>How do you compare the speed between two SQL Select expressions?
>>Typically I would do it like this:
>>
>>nStart = seconds()
>>select * ......
>>nEnd = seconds()
>>nTime = nEnd - nStart
>>
>>
>>What I am not sure is how do you account for the fact that the 1st SQL Selects creates some data buffer (I think it does but I am not sure). So, if the buffering assumption is correct, the 2nd SQL Select will have an advantage.
>>Another approach, I think, is to do 1st SQL Select. Then, shut down VFP and on the next start to do 2nd SQL Select only.
>
>I wrote about this stuff here: http://tomorrowssolutionsllc.com/ConferenceSessions/Cant%20this%20application%20go%20any%20faster.PDF
>
>Tamar

Thank you. I will read this article.
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