How Visual FoxPro Caches Tables by Using File Caching

Last reviewed: September 12, 1995
Article ID: Q136579

The information in this article applies to:

Microsoft Visual FoxPro for Windows, version 3.0

SUMMARY

This article describes the type of file caching that Visual FoxPro performs on tables.

MORE INFORMATION

Visual FoxPro performs read and write caching on tables opened exclusively. To flush the write buffers, use the FLUSH command. The write buffers are also automatically flushed periodically.

Visual FoxPro performs read-only caching on tables opened in shared mode. The update on the read cache is based on the second parameter of SET REFRESH.

Visual FoxPro performs its own file caching, so you should limit the amount of memory given to file-caching software such as SMARTDRV to approximately 256K. This gives more memory to Visual FoxPro, and Visual FoxPro can manage it more efficiently than SMARTDRV can because Visual FoxPro has more knowledge of its own disk access patterns.

Additional reference words: 3.00 VFoxWin
KBCategory: kbenv
KBSubcategory: FxenvOptimize

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.

Last reviewed: September 12, 1995
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.