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When more than this many unsent bytes are in the send buffer, the connection is considered overloaded. See Section 23.3.3.14, “Configuring NDB Cluster Send Buffer Parameters” , and Section 23.5.14.55, “The ndbinfo transporters Table” , for more information. 

• PreSendChecksum 

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If this parameter and Checksum  are both enabled, perform pre-send checksum checks, and check all SHM signals between nodes for errors. Has no effect if Checksum  is not also enabled. 

• SendBufferMemory 

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Size (in bytes) of the shared memory buffer for signals sent from this node using a shared memory connection. 

• SendSignalId 

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To retrace the path of a distributed message, it is necessary to provide each message with a unique identifier. Setting this parameter to Y  causes these message IDs to be transported over the network as well. This feature is disabled by default in production builds, and enabled in -debug  builds. 

• ShmKey 

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