DOCUMENT:Q234344  11-JUN-2002  [vbwin]
TITLE   :INFO: Template Cache Added in WebClasses for Visual Studio SP3
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER::6.0
OPER/SYS:
KEYWORDS:kbVBp600 kbWebClasses kbGrpDSASP kbVS600sp3 kbDSupport

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The information in this article applies to:

 - Microsoft Visual Basic Learning Edition for Windows, version 6.0 
 - Microsoft Visual Basic Professional Edition for Windows, version 6.0 
 - Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 
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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

   Q256986 Description of the Microsoft Windows Registry

SUMMARY
=======

A new template cache feature has been added to WebClasses for Visual Studio 6.0
Service Pack 3 (SP3). The new feature is in the new version of the WebClass
runtime (Mswcrun.dll version 6.00.8450).

MORE INFORMATION
================

This cache improves the performance of common WebClass applications that use
HTML templates and tag processing. The cache is useful only for those WebClass
applications that run on servers with enough virtual memory to cache all the
commonly used templates. If the cache is constantly exceeded, locks will occur
and templates will be re-processed. You should either set the cache to a larger
value or disable it. Also, if the administrator can guarantee there will always
be enough virtual memory for all the templates used by the WebClass, he or she
can disable the cache's LRU (least recently used) algorithm, which will slightly
increase performance and scalability.

The template cache also implements a file watch, so templates can be updated on
the server without rebooting. Also, changing the TagPrefix causes the template's
cache to be dumped and reprocessed; therefore, you should avoid changing
TagPrefixes at runtime (this is not very common) or you should disable the
cache. Extensive rescanning of tag replacements may take away performance
gains.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems
that may require you to reinstall your operating system. Microsoft cannot
guarantee that you can solve problems that result from using Registry Editor
incorrectly. Use Registry Editor at your own risk.

Registry Interface:

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Visual Basic\6.0\WebClass
ValueName: MaxTemplateCache
Default: 65 (hex) or 101 (decimal)

If the value is set to 0, the cache is disabled. If value is set to 0xFFFFFFFF,
LRU is disabled for the cache.

REFERENCES
==========

For more information, see the following article in the Microsoft Knowledge
Base:

   Q234317 BUG: Visual Studio SP3 Breaks the WebClass Runtime when Running in
   the VB IDE

Additional query words:

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Keywords          : kbVBp600 kbWebClasses kbGrpDSASP kbVS600sp3 kbDSupport 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVB600
Version           : :6.0
Issue type        : kbinfo

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