• TCP_MAXSEG_SIZE : Value used for TCP_MAXSEG. 

• TCP_RCV_BUF_SIZE : Value used for SO_RCVBUF. 

• TCP_SND_BUF_SIZE : Value used for SO_SNDBUF. 

• TcpBind_INADDR_ANY : Bind InAddrAny instead of host name for server part of connection. 

The following parameters apply to the config.ini  file’s [shm]  section: 

• Checksum : If checksum is enabled, all signals between nodes are checked for errors. 

• Group : Used for group proximity; smaller value is interpreted as being closer. 

• NodeId1 : ID of node (data node, API node, or management node) on one side of connection. 

• NodeId2 : ID of node (data node, API node, or management node) on one side of connection. 

• NodeIdServer : Set server side of SHM connection. 

• OverloadLimit : When more than this many unsent bytes are in send buffer, connection is considered overloaded. 

• PreSendChecksum : If this parameter and Checksum are both enabled, perform pre-send checksum checks, and check all SHM signals between nodes for errors. 

• SendBufferMemory : Bytes in shared memory buffer for signals sent from this node. 

• SendSignalId : Sends ID in each signal. Used in trace files. 

• ShmKey : Shared memory key; when set to 1, this is calculated by NDB. 

• ShmSpinTime : When receiving, number of microseconds to spin before sleeping. 

## 23.3.2.5 NDB Cluster mysqld Option and Variable Reference 

• ShmSize : Size of shared memory segment. 

• Signum : Signal number to be used for signalling. 

The following table provides a list of the command-line options, server and status variables applicable within mysqld  when it is running as an SQL node in an NDB Cluster. For a table showing all  command- line options, server and status variables available for use with mysqld , see Section 5.1.4, “Server Option, System Variable, and Status Variable Reference” . 

• Com_show_ndb_status : Count of SHOW NDB STATUS statements. 

• Handler_discover : Number of times that tables have been discovered. 

• ndb-batch-size : Size (in bytes) to use for NDB transaction batches. 

• ndb-blob-read-batch-bytes : Specifies size in bytes that large BLOB reads should be batched into. 0 = no limit. 

• ndb-blob-write-batch-bytes : Specifies size in bytes that large BLOB writes should be batched into. 0 = no limit. 

• ndb-cluster-connection-pool : Number of connections to cluster used by MySQL. 

• ndb-cluster-connection-pool-nodeids : Comma-separated list of node IDs for connections to cluster used by MySQL; number of nodes in list must match value set for --ndb-cluster-connection-pool. 

