CacheISAPI

The CacheISAPI property indicates whether ISAPI extensions are cached in memory after first use. If the value of this property is set to true, ISAPI extensions, once loaded, remain in the cache until the server is stopped. If the value is set to false, extensions are unloaded from memory after the ISAPI extension is no longer in use.

ISAPI extensions are cached or not cached based on the value of this property at the time they were loaded into memory for use. Thus, if this property is changed after an extension has been loaded and cached, the change will have no effect on that extension until the Web server is restarted.

Important Note:
There are severe performance implications to setting the value of this property to false. Also, some extensions cannot work properly when this property is set to false.

Schema Attributes

Attribute Name	Value
ADSI/WMI Data Type	BOOL
ABO Data Type	DWORD_METADATA
Schema Default	TRUE
Internal Default	TRUE
Upper Bound	0
Lower Bound	Not specified
Internal ID	6034
Friendly ID	MD_CACHE_EXTENSIONS
Property Attributes	INHERIT
User Type	IIS_MD_UT_FILE

Configurable Locations

You can configure this property at the following locations in the IIS metabase.

Metabase Path	IIS Admin Object Type
/LM/W3SVC	IIsWebService
/LM/W3SVC/n	IIsWebServer
/LM/W3SVC/n/ROOT/physical_directory_name /LM/W3SVC/n/virtual_directory_name/physical_directory_name	IIsWebDirectory
/LM/W3SVC/n/ROOT /LM/W3SVC/n/ROOT/virtual_directory_name	IIsWebVirtualDir

Flags

There are no flags for this property.

Requirements

Client: Requires Windows XP Professional, Windows 2000 Professional, or Windows NT Workstation 4.0.

Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.

Product: IIS

See Also