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MySQL NDB Cluster API Developer Guide
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2.4.2.16 Unknown result error

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

Error code

4008

MySQL error

DMEC

Error message

Receive from NDB failed

Error code

4009

MySQL error

HA_ERR_NO_CONNECTION

Error message

Cluster Failure

Error code

4012

MySQL error

DMEC

Error message

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