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MySQL NDB Cluster API Developer Guide
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2.4.2.15 Unknown result error

The following list enumerates all NDB errors of type UR (Unknown result error).

4008

MySQL error.  DMEC

Error message.  Receive from NDB failed

4009

MySQL error.  HA_ERR_NO_CONNECTION

Error message.  Cluster Failure

4012

MySQL error.  DMEC

Error message.  Request ndbd time-out, maybe due to high load or communication problems