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Why do queries take longer in a private datasession?
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To
21/07/1999 14:28:08
General information
Forum:
Visual FoxPro
Category:
Other
Miscellaneous
Thread ID:
00244276
Message ID:
00244282
Views:
14
Make sure when you are doing your SELECT, that the table isn't ordered. This can kill optimization. I suspect that there's some sort of order set if you're having the user browse through the table. Try using the table again using another alias and doing the SELECT from that.

Good luck,

Tom

>Here's the effect I'm aiming for: the user is browsing the database using a form. Finding the record he wants, he clicks a "print" key, and a report for the record he is viewing appears in preview mode. He can then choose to print or discard it, as he prefers.
>
>Here's how I'm trying to do it: the click method of the button performs a select based on the primary key into a temporary cursor:
>
>select * from imprint into cursor rptcursor ;
> where printno = thisform.txt_printno.value
>
>Then I invoke the report in preview mode. Since the new cursor has been selected, the report is based on it. (Shortly after I posted my previous query, I figured out that you simply empty the report's data environment to let it use whatever appropriate datasource is selected.)
>
>Since the selection value is the primary key, the SELECT is nearly instanteous when I test it manually. But when I try to embed the logic in my form, the SELECT seems to be evaluating every record in the database sequentially. The percent completed bar is displayed, and it takes about two minutes.
>
>The key to this puzzle seems to be that the form has a private datasession associated with it. When I change the datasession type to 1 (default datasession), the SELECT is, once again, nearly instantaneous. But, since this is going to be a shared network app, I really would like to keep my datasessions private.
>
>I'm assuming there's some setting I need to change in the form's data environment, but nothing is jumping out at me. Can anyone shed some light on this one?
>
>Thanks,
>BEW
>
>Barbara Weitbrecht
>National Air & Space Museum
>bew@nasm.si.edu
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