Parameters for configuring send buffer memory allocation-opracowanie

Parameters for configuring send buffer memory allocation. Send buffer memory is allocated
dynamically from a memory pool shared between all transporters, which means that the size of the
send buffer can be adjusted as necessary. (Previously, the NDB kernel used a fixed-size send buffer
for every node in the cluster, which was allocated when the node started and could not be changed
while the node was running.) The TotalSendBufferMemory [2245] and OverLoadLimit [2253]
data node configuration parameters permit the setting of limits on this memory allocation. For more
information about the use of these parameters (as well as SendBufferMemory [2253]), see
Section 17.3.2.12, “Configuring MySQL Cluster Send Buffer Parameters”.
• ExtraSendBufferMemory [2245]
This parameter specifies the amount of transporter send buffer memory to allocate in addition to any
set using TotalSendBufferMemory [2245], SendBufferMemory [2253], or both.
• TotalSendBufferMemory [2245]
This parameter is available beginning with MySQL Cluster NDB 6.4.0. It is used to determine the
total amount of memory to allocate on this node for shared send buffer memory among all configured
transporters.
If this parameter is set, its minimum permitted value is 256KB; the maxmimum is 4294967039.
• ReservedSendBufferMemory [2245]
This parameter is present in NDBCLUSTER source code beginning with MySQL Cluster NDB 6.4.0.
However, it is not currently enabled.
This parameter was deprecated in MySQL Cluster NDB 7.2, and is subject to removal in a future
release of MySQL Cluster (Bug #11760629, Bug #53053).
For more detailed information about the behavior and use of TotalSendBufferMemory [2245]
and about configuring send buffer memory parameters in MySQL Cluster, see Section 17.3.2.12,
“Configuring MySQL Cluster Send Buffer Parameters”.
See also Section 17.5.13, “Adding MySQL Cluster Data Nodes Online”.
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