# Understanding MySQL Slow Query graph on Grafana

**URL:** https://forums.percona.com/t/understanding-mysql-slow-query-graph-on-grafana/7355
**Category:** PMM 1.x
**Created:** [December 19, 2019, 9:57am UTC](https://forums.percona.com/t/understanding-mysql-slow-query-graph-on-grafana/7355 "2019-12-19T09:57:26Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![sh123](https://avatars.discourse-cdn.com/v4/letter/s/a9a28c/32.png) [@sh123](https://forums.percona.com/u/sh123)
#### Post date: [December 19, 2019, 9:57am UTC](https://forums.percona.com/t/understanding-mysql-slow-query-graph-on-grafana/7355/1 "2019-12-19T09:57:26Z")

</div>

I’m having troubles understanding what the graph shows for the MySQL Slow Query graph, particularly with what the y axis represents.  
I’ve attached photos of some results I see, I understand the graph shows all slow queries that took longer than the long\_query\_time variable set. For my case the value is 0.25 . So I’m seeing all queries that took longer than 0.25s. But I thought I would be seeing number i.e. integers in the y axis to show number x slow queries within a specific time frame. But i’m seeing decimals, lower than 0.25 value which confuses me.

Usually values ranges between 0 and 1 but some cases spikes very high to 32,000.

Does anyone know how to interpret this graph? I’m trying to set alert notifications but won’t know suitable numbers to choose unless I fully understand what graph represents.

 ![photoid=55103](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/1/125d32ab93a0a2ffe7879f0dc00b2524a206fd64.png)

 ![photoid=55104](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/b/b9c8e23bd6a7e091deffb1f1c2ba1b4cceb7f554.png)

 ![photoid=55105](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/f/f0db93ce97528f5fe90bbe05540e1ef23e335359.png)

 ![photoid=55106](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/4/4e7cfd3d98003c1b82760d0bba7a9512dbbab143.png)