DOCUMENT:Q174584 12-AUG-1999 [foxpro] TITLE :BUG: Scrolling in Grid May Be Slow with Filtered Cursor PRODUCT :Microsoft FoxPro PROD/VER:Win:3.0,3.0b,5.0,5.0a OPER/SYS: KEYWORDS:kbvfp kbvfp300 kbvfp500 kbvfp600 ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a, 6.0 ------------------------------------------------------------------------------- SYMPTOMS ======== Scrolling in a grid might be slow if the RecordSource of the grid points to a cursor, which actually is a filter of the table. RESOLUTION ========== Use the following steps to work around the problem: 1. Use the SET KEY TO command to filter the data instead of using a SQL SELECT command. For example if you wanted to find all the records that have CA for the region field, use the following code: SET ORDER TO xregion SET KEY TO "CA" This is assuming that there is a index tag on the region field called "xregion." 2. Use the NOFILTER clause in the SQL STATEMENT to ensure that the cursor created will not be a filter. This clause is only valid in Visual FoxPro 5.0. In Visual FoxPro 3.0 you can add a ".T." to the field list to prevent the filter. For example: SELECT *,.t. FROM Customer WHERE country = "USA" INTO CURSOR test STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. MORE INFORMATION ================ This problem occurs only with cursors created with the SQL SELECT command. A local view will not create a filtered cursor. Steps to Reproduce Behavior --------------------------- 1. Use a large table with more than 200,000 records. 2. Create a simple SQL SELECT statement such as the following: SELECT * FROM Customer WHERE country = "USA" INTO CURSOR test 3. Create a form with a grid on it. 4. Set the RecordSource property of the grid to the cursor test. 5. Run the form. 6. Drag the scroll button of the grid all the way to the bottom. The grid takes a long time to refresh. The larger the table, the longer it will take. (c) Microsoft Corporation 1997, All Rights Reserved. Contributions by David Botzenhart, Microsoft Corporation Additional query words: ====================================================================== Keywords : kbvfp kbvfp300 kbvfp500 kbvfp600 Technology : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP300b kbVFP500 kbVFP600 kbVFP500a Version : Win:3.0,3.0b,5.0,5.0a Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.