An important restriction to the use of dynamic groups in portal is that only 2 caching options can be used for pages in portal. They are 1) Don't cache 2) Cache page definition content for X minutes
The reason for these particular caching options is because portal will invalidate pages when a group or a user that is referenced in that page's Access Control List (ACL) in portal are modified or deleted.
Portal gets this information from OID through the DIP (Directory Integration Provisioning) ; however for dynamic groups there is no such notification. The portal does not have any automated way to know that changes have been done to the dynamic groups.
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