Documentation Home
MySQL NDB Cluster 7.3-7.4
Related Documentation Download this Excerpt

MySQL NDB Cluster 7.3-7.4  /  ...  /  The ndbinfo disk_write_speed_aggregate_node Table

7.14.11 The ndbinfo disk_write_speed_aggregate_node Table

The disk_write_speed_aggregate_node table provides aggregated information per node about the speed of disk writes during LCP, backup, and restore operations.

As of NDB 7.4.3, the disk_write_speed_aggregate_node contains the following columns (information relating to NDB 7.4.2 and earlier can be found later in this section):

  • node_id

    Node ID of this node

  • backup_lcp_speed_last_sec

    Number of bytes written to disk by backup and LCP processes in the last second

  • redo_speed_last_sec

    Number of bytes written to REDO log in the last second

  • backup_lcp_speed_last_10sec

    Number of bytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds

  • redo_speed_last_10sec

    Number of bytes written to REDO log per second, averaged over the last 10 seconds

  • backup_lcp_speed_last_60sec

    Number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds

  • redo_speed_last_60sec

    Number of bytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds

Notes

Prior to NDB 7.4.3, columns of this table showed values in kilobytes. (In NDB 7.4.3 and later, the columns display all such values in bytes.) (Bug #74317, Bug #19795072) In NDB 7.4.2 and earlier, the disk_write_speed_aggregate contains the following columns:

  • node_id

    Node ID of this node

  • backup_lcp_speed_last_sec

    Number of kilobytes written to disk by backup and LCP processes in the last second

  • redo_speed_last_sec

    Number of kilobytes written to REDO log in the last second

  • backup_lcp_speed_last_10sec

    Number of kilobytes written to disk by backup and LCP processes per second, averaged over the last 10 seconds

  • redo_speed_last_10sec

    Number of kilobytes written to REDO log per second, averaged over the last 10 seconds

  • backup_lcp_speed_last_60sec

    Number of kilobytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds

  • redo_speed_last_60sec

    Number of kilobytes written to disk by backup and LCP processes per second, averaged over the last 60 seconds

The disk_write_speed_aggregate_node table was added in NDB 7.4.1.