# View index usage

**URL:** <https://forums.percona.com/t/view-index-usage/26802>\
**Category:** PMM 2.x\
**Tags:** pmm, percona, mongodb\
**Created:** [November 27, 2023, 12:57pm UTC](https://forums.percona.com/t/view-index-usage/26802 "2023-11-27T12:57:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Alexei\_Fokin](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/alexei_fokin/32/13579_2.png) [@Alexei\_Fokin](https://forums.percona.com/u/Alexei_Fokin)\
**Post date:** [November 27, 2023, 12:57pm UTC](https://forums.percona.com/t/view-index-usage/26802/1 "2023-11-27T12:57:35Z")

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## Description:

How to set up monitoring to view the frequency of use of mongoDB indexes?

## Version:

pmm 2.40.1  
used percona-mongodb-operator

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<div class="post-metadata">

**Author:** ![Parag\_Bhayani](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/parag_bhayani/32/3710_2.png) [@Parag\_Bhayani](https://forums.percona.com/u/Parag_Bhayani)\
**Post date:** [December 4, 2023, 7:48pm UTC](https://forums.percona.com/t/view-index-usage/26802/2 "2023-12-04T19:48:37Z")

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Hi @Alexei_Fokin ,

You can use the below metrics to monitor the frequency of use of MongoDB indexes.

> mongodb\_indexstats\_accesses\_ops

Regards,

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<div class="post-metadata">

**Author:** ![Alexei\_Fokin](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/alexei_fokin/32/13579_2.png) [@Alexei\_Fokin](https://forums.percona.com/u/Alexei_Fokin)\
**Post date:** [December 4, 2023, 7:55pm UTC](https://forums.percona.com/t/view-index-usage/26802/3 "2023-12-04T19:55:34Z")

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![image](https://us1.discourse-cdn.com/flex019/uploads/percona1/original/2X/b/b0d58ad529a9541ff1a32c407b4aaa1e187dd873.png)  
What if this metric doesn’t exist?

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<div class="post-metadata">

**Author:** ![Parag\_Bhayani](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/parag_bhayani/32/3710_2.png) [@Parag\_Bhayani](https://forums.percona.com/u/Parag_Bhayani)\
**Post date:** [December 4, 2023, 7:58pm UTC](https://forums.percona.com/t/view-index-usage/26802/4 "2023-12-04T19:58:27Z")

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Hi @Alexei_Fokin ,

It seems that the `indexstats` collector has not been enabled.

PMM starts the MongoDB exporter by default only with `diagnosticdata` and `replicasetstatus` collectors enabled.  
There are other collectors ( `collstats` , `dbstats` , `indexstats` , and `topmetrics`) which are not enabled by default. So you need to explicitly enable the collectors while adding mongodb service into PMM.

Kindly refer this [link](https://docs.percona.com/percona-monitoring-and-management/details/commands/pmm-admin.html#advanced-options) on how to enable collectors.

Regards,