Re: Test My Cluster ?
MySQL Cluster is predominantly an in-memory database, which means you cannot assume your data changes are durable if you shut down the cluster (e.g. if you shut down all data nodes in one node group.)
This means you should try to keep the cluster running at all times if you want to retain your data changes, or you should backup the cluster immediately before shutting it down.
You can also read about "local checkpoints" and how the cluster uses them to record the state of the database periodically. Start here:
http://dev.mysql.com/doc/refman/5.6/en/mysql-cluster-basics.html
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