The PSAPPSRV is responsible for the majority of the work on the application server.  It is just as important to start enough PSAPPSRVs as it is to not start too many.  By default, each PSAPPSRV has it’s own Cache folder (unless you enabled shared cache).  For example, if you start 10 PSAPPSRV processes and you only have 5-6 users, it will take a very long time to build the cache for all 10 PSAPPSRV processes.  On the other hand, if you have 5 users and 2 PSAPPSRV processes, the cache should get built up pretty quickly and 2 PSAPPSRVs should be able to handle the number of requests coming in from 5 users.

To delete the server cache, normally we bring down the application server services and deltete the contents under $PS_HOME/appserv/{domain}/cache folder. We can workaround this complicated process by invalidating the current cache. You can use the following command to invalidate the cache.

UPDATE PSSTATUS SET LASTREFRESHDTTM = SYSDATE

Hope this helps some of you guys.