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22.5.14.22 The ndbinfo diskstats_1sec Table

The diskstats_1sec table provides information about writes to Disk Data tablespaces over the past 20 seconds.

The diskstat table contains the following columns:

  • node_id

    Node ID of this node

  • block_instance

    ID of reporting instance of PGMAN

  • pages_made_dirty

    Pages made dirty during the designated 1-second interval

  • reads_issued

    Reads issued during the designated 1-second interval

  • reads_completed

    Reads completed during the designated 1-second interval

  • writes_issued

    Writes issued during the designated 1-second interval

  • writes_completed

    Writes completed during the designated 1-second interval

  • log_writes_issued

    Number of times a page write has required a log write during the designated 1-second interval

  • log_writes_completed

    Number of log writes completed during the designated 1-second interval

  • get_page_calls_issued

    Number of get_page() calls issued during the designated 1-second interval

  • get_page_reqs_issued

    Number of times that a get_page() call has resulted in a wait for I/O or completion of I/O already begun during the designated 1-second interval

  • get_page_reqs_completed

    Number of get_page() calls waiting for I/O or I/O completion that have completed during the designated 1-second interval

  • seconds_ago

    Number of 1-second intervals in the past of the interval to which this row applies

Notes

Each row in this table corresponds to an instance of PGMAN during a 1-second interval occurring from 0 to 19 seconds ago; there is one such instance per LDM thread plus an additional instance for each data node.

The diskstats_1sec table was added in NDB 8.0.19.