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Excerpts from this Manual The ndbinfo resources Table

This table provides information about data node resource availability and usage.

These resources are sometimes known as super-pools.

The following table provides information about the columns in the resources table. For each column, the table shows the name, data type, and a brief description. Additional information can be found in the notes following the table.

Table 22.396 Columns of the resources table

Column Name Type Description
node_id integer The unique node ID of this data node.
resource_name string Name of the resource; see text.
reserved integer The amount reserved for this resource.
used integer The amount actually used by this resource.
max integer The maximum amount of this resource used, since the node was last started.

The resource_name can be one of the names shown in the following table:

Table 22.397 ndbinfo.resources table resource names and descriptions

Resource name Description
RESERVED Reserved by the system; cannot be overridden.
DISK_OPERATIONS If a log file group is allocated, the size of the undo log buffer is used to set the size of this resource. This resource is used only to allocate the undo log buffer for an undo log file group; there can only be one such group. Overallocation occurs as needed by CREATE LOGFILE GROUP.
DISK_RECORDS Records allocated for Disk Data operations.
DATA_MEMORY Used for main memory tuples, indexes, and hash indexes. Sum of DataMemory and IndexMemory, plus 8 pages of 32 KB each if IndexMemory has been set. Cannot be overallocated.
JOBBUFFER Used for allocating job buffers by the NDB scheduler; cannot be overallocated. This is approximately 2 MB per thread plus a 1 MB buffer in both directions for all threads that can communicate. For large configurations this consume several GB.
FILE_BUFFERS Used by the redo log handler in the DBLQH kernel block; cannot be overallocated. Size is NoOfFragmentLogParts * RedoBuffer, plus 1 MB per log file part.
TRANSPORTER_BUFFERS Used for send buffers by ndbmtd; the sum of TotalSendBufferMemory and ExtraSendBufferMemory. This resource that can be overallocated by up to 25 percent. TotalSendBufferMemory is calculated by summing the send buffer memory per node, the default value of which is 2 MB. Thus, in a system having four data nodes and eight API nodes, the data nodes have 12 * 2 MB send buffer memory. ExtraSendBufferMemory is used by ndbmtd and amounts to 2 MB extra memory per thread. Thus, with 4 LDM threads, 2 TC threads, 1 main thread, 1 replication thread, and 2 receive threads, ExtraSendBufferMemory is 10 * 2 MB. Overallocation of this resource can be performed by setting the SharedGlobalMemory data node configuration parameter.
DISK_PAGE_BUFFER Used for the disk page buffer; determined by the DiskPageBufferMemory configuration parameter. Cannot be overallocated.
QUERY_MEMORY Used by the DBSPJ kernel block.
SCHEMA_TRANS_MEMORY Minimum is 2 MB; can be overallocated to use any remaining available memory.