Invalidation-based caching is performed using OracleAS Web Cache. An item remains in the cache until some event occurs that requires it to be refreshed. You can set the expiry time for invalidation-based caching.
Validation-based caching is performed using the portal cache. Before an item in the portal cache is used, Portal Services contacts the OracleAS Metadata Repository or a Provider to determine if the cached item is still valid.
Expiry-based caching also uses the portal cache. A retention period for the item specifies how long it is valid in the cache, before a refresh is required. Pages that use expiry-based caching may also be cached in the user's browser.
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