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Performance issues when querying shared data
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General information
Forum:
Visual FoxPro
Category:
Client/server
Environment versions
Visual FoxPro:
VFP 6
Miscellaneous
Thread ID:
01057091
Message ID:
01057173
Views:
12
Sorry, haven't tried that. Why?

>Mathias,
>What happens if the table is on your local computer?
>
>
>>Hi Mike,
>>
>>Yes I can and I have by introducing a dummy where clause. It optimises and halves the time roughly 2 seconds.
>>
>>It would appear optimisation is the real issue. I can live with the slight difference, and I am hoping the customer will be happy with that.
>>
>>Cheers!
>>
>>Mathias
>>>Hi Mathias
>>>
>>>>Hi All,
>>>>
>>>>I have had reports and a colleague has confirmed that a query takes significantly longer if the table being queried is open shared so:
>>>>
>>>>Select a.* from Customer a Into Cursor curCustomer where ??? && takes 2 seconds when I am the only user in the system
>>>>
>>>>The same query takes 5 seconds if the table customer is open by another user.
>>>>
>>>>No views involved
>>>>
>>>>Any ideas please?
>>>
>>>I just tried a small experiment. Querying a million record table for 10,000 results over the network - only me using the table .591 seconds. With a second user, .7 seconds. Of course my query is fully optimized. Caching will play a role.
>>>
>>>I would point out, that testing single user access versus multi-user access is not the issue. Most of the time, there will be multi-user access. The issue then is, can you get the query time down from 5 seconds at all?
Mathias Banda

Time is longer than a rope.
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