> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognite.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ViewContainerCountIsOutOfLimits validation rule

> Validates that views do not reference more containers than the CDF limit allows. Prevents performance issues from excessive joins.

This rule checks that each view references no more containers than the CDF limit allows.

## Why it matters

Mapping too many containers to a single view can lead to performance issues due to the increasing number of joins
that need to be performed when querying data through the view.

## Example

If a view references 20 containers and the CDF limit is 10 containers per view,
this validator will raise a `Recommendation` issue.

## Further reading

* [Validation rules](/cdf/deploy/neat/validation/index)