如何在Pentaho中清除缓存

Question

I am using Pentaho 5. My dimensions keep changing frequently and I need the changes to be applied to the dashboard, this is not possible because Pentaho keeps caching. I have created the cube using the datasource wizard and the querys using mdx over mondrian jndi. Even though I set the property Cache to false or set cache duration doesn't seem to work. Is there a API that I can use with mondrian jndi to clear cache? Or are there any property files that I should change? Please help.

Answer 1

In Pentahoo 7 the "Clear Cache" option is in a different Menu:

Tools -> Database -> Clear Cache

If you are using Database lookup and if you are getting older fields, cleaning cache can actually solved the problem. It worked for me.

Answer 2

You can do it manually inside Pentaho User Console: Tools -> Refresh -> Mondrian Schema Cache.

Or you can make schedule for refreshing cache: find clear_mondrian_schema_cache.xaction inside your installation and schedule it.

Answer 3

Option 1: You can read http://javadoc.pentaho.com/bi-platform500/webservice500/ for api details.
And also you can refresh Reporting Metadata Cache via web service, you can use the following web service call: http://localhost:8080/pentaho/api/system/refresh/metadata

Option2: You can navigate to \\biserver-ee\\tomcat\\webapps\\pentaho\\WEB-INF\\classes and change the configuration file "ehcache.xml"

<cache name="report-dataset-cache"
maxElementsInMemory="50"
eternal="false"
overflowToDisk="false"
timeToIdleSeconds="1"
timeToLiveSeconds="2"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="1"
/>

If you have done that and still no positive answer, I think you have not restarted the BA server. If the issue still exists comment below.

Answer 4

There are 2 options

1. One is to schedule "clear mondrian schema" on ba server but for that to happen , you need to get clear_mondrian_schema.xml from pentaho-solutions/systems folder and upload it in some folder that you can access on ba server. You can then use normal schedule file options to achieve you want. This put a lof of load on BA server though.

2. My second recommendation is if you are using cubes/schema and building using schema workbench, you can turn the caching off. If your database is architecturally good and your schemas all well defined, user will get updates/new data as soon as they refresh.