#### 28.4.4.21 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`](performance-schema-statement-summary-tables.html) 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.

##### Example

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

```
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;
```

