Purging Cache Without Shutting Down

...

Fri, 02 Jun 2006 12:09:07 +0100

I believe the servlet directives will work in Tools 8.43, but you'll have to shut down to purge app server cache. - Brent Martin

Comment from sush

Fri, 02 Jun 2006 11:37:18 +0100

this will not work in Peopel tool 8.43..? - sush

...

Tue, 25 Apr 2006 07:26:59 +0100

Yes, each PSAPPSRV process keeps a certain amount of in-memory cache. A PSAPPSRV process will restart and flush the in-memory cache when the number of transactions processed reaches the Recycle Count specifed in the Application Server configuration file, psappsrv.cfg.

If you find you're having to shut down and clear in memory cache frequently, you might think about reducing the Recycle Count.

Since state is managed on the web server and not the app server, many (if not most) DBA/Admins elect to create two app servers and shut down one at a time when necessary like you described (of course the web server has to be configured to round-robin between both of them). Every once in a while I'll hear about a user getting an unexpected result, but it works well for the most part. All the same, I don't usually stop anything during busy periods unless its an emergency. - Brent Martin

Comment from David Vandiver

Mon, 24 Apr 2006 20:28:21 +0100

Does the App Server also have a copy of the cache in memory (our dba believes it does)? Does the process in PSADMIN clear the memory cache as well?

We usually clear the memory cache by rebooting the app server; we usually can leave the file cache intact (but not always). In production, we have 2 app servers; the dbas reboot the app servers one at a time to flush the memory of cache (while allowing production to be up and running). - David Vandiver