> ## Documentation Index
> Fetch the complete documentation index at: https://codspeed.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# Database Instrument Overview
> The database instruments measure the performance of database queries directly in the CI
export const MongoDBIcon = props => ;
The database instruments allow measuring the performance of **database queries**
directly in the CI. For each benchmark, information about the database queries
is displayed in the CodSpeed dashboard. The following performance issues can be
detected:
* **Un-optimized queries**: queries that are not using indexes or are not using
them efficiently
* **N+1 queries**: queries that are executed multiple times for each item in a
list instead of using a single query (*coming soon*)
The following benefits can be expected from using the database instruments:
* Full visibility on the performance of your database queries, **directly in the
CI**
* **Detect and fix problematic queries** before they are deployed to production
## How it works
When enabled, the CodSpeed Action will automatically spawn a proxy server that
will intercept all database queries. Each query will be executed against a real
database and the response sent back to the application.
For each query, the CodSpeed proxy will communicate with the real database to
gather the **explain plan** and other metrics about it. When the run is
finished, the data is sent to CodSpeed where it is processed.
## Supported Databases
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If there is another database you would like to see supported, please reach out
to us via [Discord](https://discord.gg/MxpaCfKSqF) or
[email out support](mailto:contact@codspeed.io).
The following benefits can be expected from using the database instruments:
* Full visibility on the performance of your database queries, **directly in the
CI**
* **Detect and fix problematic queries** before they are deployed to production
## How it works
When enabled, the CodSpeed Action will automatically spawn a proxy server that
will intercept all database queries. Each query will be executed against a real
database and the response sent back to the application.
For each query, the CodSpeed proxy will communicate with the real database to
gather the **explain plan** and other metrics about it. When the run is
finished, the data is sent to CodSpeed where it is processed.
## Supported Databases