26.4.4.21 ps_statement_avg_latency_histogram()过程

显示“性能模式events_statements_summary_by_digest”table 中跟踪的所有规范化语句的平均延迟值的文本直方图。

此过程可用于显示此 MySQL 实例中运行的语句的延迟分布的高级视图。

Parameters

None.

Example

直方图以语句单位输出。例如，直方图图例中的* = 2 unitstable 示每个*字符代 table2 条语句。

mysql> CALL sys.ps_statement_avg_latency_histogram()\G
*************************** 1. row ***************************
Performance Schema Statement Digest Average Latency Histogram:

  . = 1 unit
  * = 2 units
  # = 3 units

(0 - 66ms)     88  | #############################
(66 - 133ms)   14  | ..............
(133 - 199ms)  4   | ....
(199 - 265ms)  5   | **
(265 - 332ms)  1   | .
(332 - 398ms)  0   |
(398 - 464ms)  1   | .
(464 - 531ms)  0   |
(531 - 597ms)  0   |
(597 - 663ms)  0   |
(663 - 730ms)  0   |
(730 - 796ms)  0   |
(796 - 863ms)  0   |
(863 - 929ms)  0   |
(929 - 995ms)  0   |
(995 - 1062ms) 0   |

  Total Statements: 114; Buckets: 16; Bucket Size: 66 ms;