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This procedure deletes all cached pages and regions for a specified application that have passed the defined active time period. When you cache a page or region, you specify an active time period (or Cache Timeout). Once that period has passed, the cache will no longer be used, thus removing those unusable pages or regions from the cache.
Syntax
APEX_UTIL.CACHE_PURGE_STALE ( p_application IN NUMBER,
Parameters
Table: CACHE_PURGE_STALE Parameters describes the parameters available in the CACHE_PURGE_STALE
procedure.