25.6.16.32 The ndbinfo diskstats_1sec Table (original) (raw)

25.6.16.32 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 ofPGMAN
• 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 ofPGMAN 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.