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

# Quotas and limits in Managed Service for ClickHouse®


Managed Service for ClickHouse® has the following limits:

* [_Quotas_](https://console.yandex.cloud/cloud?section=quotas) are organizational constraints that can be changed by contacting technical support.
* _Limits_ are technical constraints of the Yandex Cloud architecture. You cannot change the limits.


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 {#mch-quotas}

#|
|| **Type of limit** | **Value** ||
|| Number of clusters per cloud 
`mdb.clusters.count` | 16 ||
|| Total number of CPU cores for all database hosts per cloud 
`mdb.cpu.count` | 64 ||
|| Total virtual memory for all database hosts per cloud 
`mdb.memory.size` | 512 GB ||
|| Total storage capacity for all clusters per cloud 
`mdb.ssd.size` | 4,096 GB ||
|| Number of GPUs 
`mdb.gpu.count` | 0 ||
|#

#### Limits {#mch-limits}

#|
|| **Type of limit** | **Minimum value** | **Maximum value** ||
|| Host class | b1.medium (2 × [50%](../../compute/concepts/performance-levels.md) vCPUs, Intel Broadwell, 4 GB RAM) | m4a-c224-m1792 (224 vCPU AMD Zen 4, 1,792 GB RAM) ||
|| Number of ClickHouse® hosts per non-sharded cluster when using a network HDD or SSD storage or an ultra high-speed network SSD storage with three replicas | 1 | 7 ||
|| Number of ClickHouse® hosts per non-sharded cluster when using a non-replicated SSD storage | 3 | 7 ||
|| Number of ClickHouse® hosts per non-sharded cluster when using a local SSD storage | 2 | 7 ||
|| Number of shards per sharded cluster | 1 | 100 ||
|| Number of hosts per shard when using a network HDD or SSD storage or an ultra high-speed network SSD storage with three replicas | 1 | 7 ||
|| Number of hosts per shard when using a non-replicated SSD storage | 3 | 7 ||
|| Number of hosts per shard when using a local SSD storage | 2 | 7 ||
|| Total number of hosts per cluster | 1 | 355 (50 shards × 7 hosts + 5 ZooKeeper hosts) ||
|| Amount of data per host when using a network HDD or SSD storage (for Intel Broadwell and Intel Cascade Lake) | 10 GB | 4,096 GB ||
|| Amount of data per host when using a network HDD or SSD storage (for Intel Ice Lake) | 10 GB | 8192 GB ||
|| Amount of data per host when using a non-replicated SSD storage or an ultra high-speed network SSD storage with three replicas | 93 GB | 16,368 GB ||
|| Amount of data per host when using a local SSD storage (for Intel Broadwell and Intel Cascade Lake) | 100 GB | 1500 GB ||
|| Amount of data per host when using a local SSD storage (for Intel Ice Lake and AMD Zen 4) | 368 GB | 5888 GB ||
|| Number of databases per cluster | 1 | 1000 ||
|#

#### Limits on the maximum number of objects {#mch-objects-limits}

The limits on the maximum number of objects per cluster have two threshold values:

* _Soft limit_: When reached, the `system.warnings` [system table](https://clickhouse.com/docs/enen/operations/system-tables/system_warnings) will display a warning.

* _Hard limit_: When reached, creating new objects of this type will end with an error message.

    {% note info "Note" %}

    The _hard limit_ threshold only works in ClickHouse® 25.2 and higher.

    {% endnote %}

#|
|| **Type of limit** | **Soft limit** | **Hard limit** ||
|| Number of databases | 500 | 1,000 ||
|| Number of tables | 5,000 | 10,000 ||
|| Number of views | 5,000 | 10,000 ||
|| Number of external dictionaries | 500 | 1,000 ||
|#

All limits are implemented based on the [ClickHouse® server settings](https://clickhouse.com/docs/enen/operations/server-configuration-parameters/settings). You cannot change them.

_ClickHouse® is a registered trademark of [ClickHouse, Inc](https://clickhouse.com)._