[Yandex Cloud documentation](../../index.md) > [Yandex Managed Service for YDB](../index.md) > [Concepts](index.md) > Quotas and limits

# Quotas and limits in Managed Service for YDB

Yandex Managed Service for YDB has the following limits:

* [_Quotas_](https://console.yandex.cloud/cloud?section=quotas) are organizational constraints that can be changed by technical support on request.
* _Limits_ are technical constraints due to YDB architecture. Limits cannot be changed.

If you need more resources, you can increase your quotas in one of the following ways:

* [Make a request to increase your quotas](https://console.yandex.cloud/cloud?section=quotas).
* Contact [support](https://center.yandex.cloud/support) and specify which quotas you want increased and by how much.

To have your request processed, you must have the `quota-manager.requestOperator` [role](../../iam/roles-reference.md#quota-manager-requestoperator) or higher, e.g., `editor` or `admin`.

You can manage your quotas with [Cloud Quota Manager](../../quota-manager/quickstart.md).

#### Quotas {#ydb-quotas}

**Dedicated instance mode**

#|
|| Type of limit | Default value ||
|| Total number of CPU cores for all database hosts per cloud
`ydb.dedicatedComputeCores.count` | 64 ||
|| Total virtual memory for all database hosts per cloud
`ydb.dedicatedComputeMemory.size` | 256 GB ||
|| Maximum number of hosts per cloud
`ydb.dedicatedComputeNodes.count` | 8 ||
|| Maximum number of databases per cloud
`ydb.dedicatedDatabases.count` | 4 ||
|| Maximum number of storage groups per cloud
`ydb.dedicatedStorageGroups.count` | 8 ||
|#

**Serverless mode**

#|
|| Type of limit | Default value ||
|| Maximum number of databases
`ydb.serverlessDatabases.count` | 10 ||
|| Maximum number of serverless request units per second, per cloud
`ydb.serverlessRequestUnitsPerSecond.count` | 1,000 RUs ||
|| Maximum number of schema operations^*^ per day in a single serverless database
`ydb.schemaOperationsPerDay.count` | 1,000 ||
|| Maximum number of schema operations^*^ per minute in a single serverless database
`ydb.schemaOperationsPerMinute.count` | 30 ||
|| Total storage size of serverless databases
`ydb.serverlessStorage.size` | 300 GB ||
|| Number of Data Streams shards in a serverless database
`ydb.dataStreamShards.count` | 100 ||
|| Number of billable request units per second in serverless mode
`ydb.serverlessProvisionedCapacity.count` | 1,000 ||
|#

^*^Operations with quotas: creating, updating, and deleting table schemas, getting a table description, getting a list of tables, and creating and deleting directories.

#### Limits {#ydb-limits}

For more information about YDB database limits, see the [documentation](https://ydb.tech/docs/en//concepts/limits-ydb).