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27.4.4.21 The ps _statement _avg _latency _histogram () Procedure

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Displays a textual histogram graph of the average latency values across all normalized statements tracked within the Performance Schema events_statements_summary_by_digest table.

This procedure can be used to display a very high-level picture of the latency distribution of statements running within this MySQL instance.

Parameters

None.

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Example

The histogram output in statement units. For example, * = 2 units in the histogram legend means that each * character represents 2 statements.

  1. mysql> CALL sys.ps_statement_avg_latency_histogram()\G
  2. *************************** 1. row ***************************
  3. Performance Schema Statement Digest Average Latency Histogram:
  4.  
  5.   . = 1 unit
  6.   * = 2 units
  7.   # = 3 units
  8.  
  9. (0 - 66ms)     88  | #############################
  10. (66 - 133ms)   14  | ..............
  11. (133 - 199ms)  4   | ....
  12. (199 - 265ms)  5   | **
  13. (265 - 332ms)  1   | .
  14. (332 - 398ms)  0   |
  15. (398 - 464ms)  1   | .
  16. (464 - 531ms)  0   |
  17. (531 - 597ms)  0   |
  18. (597 - 663ms)  0   |
  19. (663 - 730ms)  0   |
  20. (730 - 796ms)  0   |
  21. (796 - 863ms)  0   |
  22. (863 - 929ms)  0   |
  23. (929 - 995ms)  0   |
  24. (995 - 1062ms) 0   |
  25.  
  26.   Total Statements: 114; Buckets: 16; Bucket Size: 66 ms;

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Document created the 26/06/2006, last modified the 26/10/2018
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