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Slow grid
Message
From
04/06/2001 15:47:13
 
 
To
04/06/2001 15:41:31
David Fluker
NGIT - Centers For Disease Control
Decatur, Georgia, United States
General information
Forum:
Visual FoxPro
Category:
Forms & Form designer
Title:
Miscellaneous
Thread ID:
00514757
Message ID:
00514795
Views:
13
>>hello,
>>
>>I have 2 occasions where I have a much slower grid ( and I know that I've done this before without a problem, but... )
>>
>>1. filters
>>??? slow slow slow ( only ~20 records on test table )
>>
>>2. DynamicBackColor
>>not sure why, there are only 2 iif() and 1 rgb() in the string, and only 20 records in the test cursor driving the grid.
>>
>>It's the same base table that drives these two problems. The filtered grid is a modal form that will always be spawned from the form with the DynamicBackColor, if that makes any differance.
>>
>>ideas?
>>
>>- jer
>
>1. Filters
>Be sure your filter does not conflict with your sorting index. In other words, SET ORDER TO LastName and SET FILTER TO ZipCode = "23456" can be slow because each time you change go to the next record it has to check the table for the filtered value. With only 20 records I wouldn't think that would be much of a problem, but it can definitely be a problem with a few hundred records. You can get around it with some creative indexing.
>
>2. DynamicBackColor
>Just a wild guess, but see if your test cursor is based on a large table. If so, add NOFILTER to be sure you're truely woking on a small cursor.

all test data totals about 45 records.


I just read somewhere about grids not optimizing the filter clause, use set key as an alt. tring to, but it requires a range and i want an "all except" type filter (key).
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