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25.6.16.51 The ndbinfo resources Table

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

These resources are sometimes known assuper-pools.

Theresources table contains the following columns:

  • node_id

    The unique node ID of this data node.

  • resource_name

    Name of the resource; see text.

  • reserved

    The amount reserved for this resource, as a number of 32KB pages.

  • used

    The amount actually used by this resource, as a number of 32KB pages.

  • max

    The maximum amount (number of 32KB pages) of this resource that is available to this data node.

Notes

Theresource_name can be any one of the names shown in the following table:

  • RESERVED: Reserved by the system; cannot be overridden.

  • TRANSACTION_MEMORY: Memory allocated for transactions on this data node. In NDB 8.0.19 and later this can be controlled using theTransactionMemory configuration parameter.

  • 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 byCREATE 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 theDBLQH kernel block; cannot be overallocated. Size isNoOfFragmentLogParts *RedoBuffer, plus 1 MB per log file part.

  • TRANSPORTER_BUFFERS: Used for send buffers byndbmtd; the sum ofTotalSendBufferMemory andExtraSendBufferMemory. 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 byndbmtd 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 theSharedGlobalMemory data node configuration parameter.

  • DISK_PAGE_BUFFER: Used for the disk page buffer; determined by theDiskPageBufferMemory configuration parameter. Cannot be overallocated.

  • QUERY_MEMORY: Used by theDBSPJ kernel block.

  • SCHEMA_TRANS_MEMORY: Minimum is 2 MB; can be overallocated to use any remaining available memory.