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

# Quotas and constraints in Key Management Service

## Quotas

Key Management Service has quotas on the number of symmetric and asymmetric keys.

| Quota name                | Default value per [tenant](/iam/overview#tenants) |
| :------------------------ | :------------------------------------------------ |
| Number of symmetric keys  | 100,000                                           |
| Number of asymmetric keys | 100,000                                           |

<Note>
  A deleted key counts towards the quota for 30 days after you [delete](/kms/manage/delete-restore) it.
</Note>

For details on what quotas are and how to manage them, see [Quotas in Nebius AI Cloud](/overview/quotas).

## Constraints

The number of [manual rotations](/kms/manage/rotate) for a symmetric key can't exceed 100. If you exceed this limit, the request fails with the `HTTP 400` error.

To increase this limit for a specific symmetric key, [contact support](https://console.nebius.com/support).