FAQ

The following a list of frequently asked questions about MDX for Kylin.

Q: An explanation of MDX for Kylin query cache

A: MDX for Kylin will clear the cache in the following situations:

MDX for Kylin will actively detect Kylin Segment changes. After discovering changes, MDX for Kylin will actively clear the cache.
Dataset metadata changes. Any modification to the dataset will invalidate the query cache of the current dataset.
Execute the clear MDX query cache command to clear the query cache. Reference manual

The command is as follows:
```
  curl -X GET \
  'http://host:port/mdx/xmla/clearCache' \
  -H 'Authorization: Basic QURNSU46S1lMSU4='
```
Note: After executing the clear cache command, the query cache of all MDX project will be refreshed;
The MDX query cache automatically expires after 12 hours. The expiration time can be adjusted by setting parameter insight.mdx.mondrian.cache.expire-minute in profile $MDX_HOME/conf/insight.properties, with the parameter default value of 12 hours.

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