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Remote view speed w/ large data set, vs select to a cursor
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From
30/07/2002 11:15:01
 
 
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General information
Forum:
Visual FoxPro
Category:
Client/server
Title:
Remote view speed w/ large data set, vs select to a cursor
Miscellaneous
Thread ID:
00683953
Message ID:
00683953
Views:
62
I have a sql server table with 85K rows, a sales order line item file. Unfortunately for this application, it is difficult to come up with parameter conditions to limit the # of rows to retrieve - it makes more sense to download the whole file for the application I am working with.

In my testing, when I open the view with the use command, it takes about 3 minutes for the view to 'fully open'. What I mean by that is that when I look at the progress on the status bar, it doesn't show the full record count for 3 minutes. In other tests, if I attempt any type of io operations such as skip or replace, before the view is 'fully loaded', execution pauses on the line, forever, and/or gives me a connection is busy error.
How can I 'test if the view is ready for processing', without generating the connection busy error? For example I have code similar to the following

use v_sostrs
** need to put in some some kind of wait/loop test for view being ready
** or the same after a requery
go top
do while not eof()

REPLACE SOMEVALUE IN V_SOSTRS &&hangs or times out connection is busy
SKIP
enddo

If I execute lnresult=sqlexec(lnhandle, 'select * from sostrs','cursostrs')
It takes about 6 seconds to download 85K rows. Thereafter I can perform any io operation on the cursor that I want.

why is there such a dramatic difference here? Is it possible to make the cursor created with sqlexec(lnhandle, 'select * from sostrs','cursostrs')updatable?

Am I missing something simple or obvious, or not testing correctly?

Any suggestions would be appreciated

TIA
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