SUMMARY

This article describes optional SharePoint Portal Server functionality for caching Web Parts. This article also describes when Web Part caches are automatically updated, and how you can manually control Web Part cache updates.

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Digital Dashboards and Web Parts

The portal of your SharePoint Portal Server is integrated with the Digital Dashboard. The Digital Dashboard is a collection of modules that are called Web Parts. These Web Parts are organized on a Web page. Web Parts are reusable components that deliver Web-based content to a Digital Dashboard by wrapping Extensible Markup Language (XML), Hypertext Markup Language (HTML), and scripts with a standard property schema. This standard property schema controls how the Web Parts are rendered in a Digital Dashboard.

Because the SharePoint Portal Server portal is integrated with a digital dashboard, you can take advantage of all of the programs and services that are packaged as Web Parts. You can add new features to your portal by choosing new Web Parts from a catalog. You can also build your own Web Parts, and then plug them into your SharePoint Portal Server portal.

Caching Web Part Items

You can also cache Web Parts by editing the Advanced Settings for the Web Part, and then setting the appropriate property values under Should the content of this Web Part be cached?. If you cache these items, you may dramatically improve performance when you refresh. However, the Web Part may potentially ignore new data from a content link until the cache time-out occurs. Because of this, a Flush application level cache option is available in the Management Dashboard on your portal.

The application cache of the portal is flushed the next time that a portal page is rendered after one of the following actions:

Some actions that do not cause a cache flush include:

Because of this, a notification mechanism is available to the portal to maintain some appearance of cache coherence. This may account for 95 percent of the items from which you still have to manually flush the portal cache. Such items include:

If you use the Web Part on the Management Dashboard to flush the cache, you flush everything in the cross-user cache. However, the only entries in the per-user cache that the Web Part on the Management Dashboard can flush are the current user's. This is because the Web Part does not have access to caches that belong to other users. Per-user cached items remain cached until they time out. You can restart Internet Information Services (IIS) to flush the cross-user cache and all of the per-user caches.

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