# PMM QAN - Query Analytics API

**URL:** <https://forums.percona.com/t/pmm-qan-query-analytics-api/13409>\
**Category:** Percona Monitoring and Management (PMM)\
**Created:** [December 9, 2021, 7:54am UTC](https://forums.percona.com/t/pmm-qan-query-analytics-api/13409 "2021-12-09T07:54:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![theprasun](https://avatars.discourse-cdn.com/v4/letter/t/e274bd/32.png) [@theprasun](https://forums.percona.com/u/theprasun)\
**Post date:** [December 9, 2021, 7:54am UTC](https://forums.percona.com/t/pmm-qan-query-analytics-api/13409/1 "2021-12-09T07:54:32Z")

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How can i disable QAN Agent/API on PMM 2?  
Whats the impact on Enabling QAN on DB Performance?

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**Author:** ![matthewb](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/matthewb/32/34_2.png) [@matthewb](https://forums.percona.com/u/matthewb)\
**Post date:** [December 9, 2021, 2:55pm UTC](https://forums.percona.com/t/pmm-qan-query-analytics-api/13409/2 "2021-12-09T14:55:50Z")

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Hello @theprasun,  
There is very little impact on the DB when using PMM-QAN. When you have a slow query, as part of the cleanup process before finishing the query, MySQL collects the statistics and writes them to the slow log file on disk. This happens whether you are using QAN or not. The QAN agent simply reads this file, sends the contents to PMM server where the bulk aggregations are calculated.