Form Caching feature in ehcache.xml and its impact

Document ID : KB000009946
Last Modified Date : 08/05/2018
Show Technical Document Details

why do we need to adjust value of timeToIdleSeconds and timeToLiveSeconds for  system.form.cache  in ehcache.xml  on different environments  and how to adjust them .  


Form definitions are cached in run-time memory for better response times specially when request details are viewed


Form definition exists in run-time memory for certain duration based on configuration in a file called USMHOME/view/conf/ehcache.xml   and It is controlled by the setting :

<cache name="system.form.cache" maxBytesLocalHeap="100M" eternal="false" overflowToDisk="false" timeToIdleSeconds="2"  timeToLiveSeconds="2"/>


You can adjust the value of timeToIdleSeconds and timeToLiveSeconds   accordingly to the different environments and for different needs 

Service Catalog 12.9 CP2 and 14.1 CP2

On Production Environment , Caching form definition is highly recommended for PRODUCTION deployment : 

 To enable Form caching for fast  performance , follow the steps below

1.  Open the file USMHOME/view/conf/ehcache.xml in a text editor

2.  Locate the following line

    <cache name="system.form.cache" maxBytesLocalHeap="100M" eternal="false" overflowToDisk="false" timeToIdleSeconds="2" timeToLiveSeconds="2"/>

3.  Change the following values

             timeToIdleSeconds  to  86400

             timeToLiveSeconds  to  120000

4.  Save the file

5.  Restart catalog windows service for the change to effect


Please note

The downside of form caching is that any change to form definition in form designer would not reflect in the request which is associated with that changed form , unless catalog service is restarted. Hence it is not recommended for environments where the form definition change frequently, for example ,  your development system .  In other words ,  on your development ,  you can keep  timeToIdleSeconds  and timeToLiveSeconds  as 2  ( default one ) so that you can see the changed form reflected  in the request immediately while you develop/change  the forms frequently .  

Additional Information:
 To understand the meaning of  timeToIdleSeconds  or  timeToLiveSeconds ,  you can do google search  them to find out the explanation . 

For example :