Oracle Help for the Web

Caching at the system level

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Definition

Caching at the system level places a single copy of an object in the system cache, which is maintained on the middle tier and is available to all users. Consequently, all customization options for the object are disabled. Also, access privileges for the object will not be enforced. Examples of content that may be suitable for system-level caching include page banners and news portlets.

This help topic covers how to set up system-level caching for two objects, pages and portlets.

Notes:

It is important that you do not use system-level caching for objects that include sensitive data or other information that you do not want to display to all users.
When system-level caching is used for a page, and approvals are enabled, all pending items, rejected items, and deleted rejected items are displayed to all users. For this reason, you may not want to use system-level caching when approvals are enabled.
Portlets cached at the system level are run as the public user; only public data is shown; therefore, portlets that do not contain public data (for example, the Recent Objects portlet or the External Applications portlet) will not display.
Pages cached at the system level include a Refresh link. Users with the appropriate page privileges can click this link to invalidate the page in the cache for all users. A new version of the page is generated for all users.
When a page cached at the system level is rendered in Edit mode, all users will be able to view its various links, icons in the region banner, and action buttons. However, only those users with the appropriate page privileges will be able to select those links and icons to perform various tasks.

To complete this task, you must have at least one of the following privileges:

Portal administrator
Manage All privileges on the page group that owns the page
Manage privileges on the page
Manage Content privileges on the page

To set up system-level caching for a page:

Go to the page.
Switch to Edit mode.
Click Properties (for the page).
If necessary, click the Main tab to bring it forward.
Go to the Page Caching section, and select one of the following system-level page caching options:
- Cache Page Definition Only At System Level
- Cache Page Definition And Content At System Level For [ ] Minutes
Click OK to return to the page.

To set up system-level caching for a portlet:

Note: If the page that includes this portlet uses system-level caching, this portlet will use system-level caching as result. In the same way, if this portlet's Web Provider indicates system-level caching for the portlet, this portlet will use system-level caching. In these cases, you do not need to set up system-level caching for the portlet manually, nor will you be able to change the cache setting, as it will already be set.

Go to the page that contains the portlet.
Switch to Edit mode.
Next to the portlet, click .
Next to Portlet Caching, select Cache portlet at the system level.
Click OK to return to the page.

Additional Information

On Portal Center:

For more information go to the documentation section of Portal Center.