Test and verify the functionality of MySQL Cluster during Node Restart(NR) and System Restart(SR) During a NR the clients connected to MySQL Cluster should not notice anything except there might be some transactions aborted due to the node failure. The connected MySQL Servers should automatically be reconnected to the restarted node once it's available. Durin a SR the clients connected to MySQL Cluster will experience that no transactions can be started. One thing to note here is wheter the MySQL Server should try to wait a certain time for NDB Cluster to start when the user tries to start a transaction. There is probably a transaction timeout that could be used for this. If the system is restarted using graceful shutdown only really long running transactions should be aborted. When the NDB Cluster is started again the MySQL Servers that was previously connected will be automatically connnected and transactions can be started again.