Quotas and limits in Managed Service for ClickHouse®
Managed Service for ClickHouse® has the following limits:
- Quotas are organizational constraints that can be changed by support on request.
- 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.
- Contact 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 or higher, e.g., editor or admin.
You can manage your quotas with Cloud Quota Manager.
Quotas
|
Type of limit |
Value |
|
Number of clusters per cloud |
16 |
|
Total number of processor cores for all database hosts per cloud |
64 |
|
Total virtual memory for all database hosts per cloud |
512 GB |
|
Total storage capacity for all clusters per cloud |
4,096 GB |
Limits
| Type of limit | Minimum value | Maximum value |
|---|---|---|
| Host class | b1.medium (2 × 50% vCPU Intel Broadwell, 4 GB RAM) | m3-c80-m640 (80 vCPU Intel Ice Lake, 640 GB RAM) |
| Number of ClickHouse® hosts per non-sharded cluster when using an HDD or SSD network storage or an ultra high-speed network storage with three replicas (SSD) | 1 | 7 |
| Number of ClickHouse® hosts in a non-sharded cluster when using non-replicated SSD storage | 3 | 7 |
| Number of ClickHouse® hosts in a non-sharded cluster when using local SSD storage | 2 | 7 |
| Number of shards in a sharded cluster | 1 | 50 |
| Number of hosts per shard when using an HDD or SSD network storage or an ultra high-speed network storage with three replicas (SSD) | 1 | 7 |
| Number of hosts in a shard when using non-replicated SSD storage | 3 | 7 |
| Number of hosts in a shard when using local SSD storage | 2 | 7 |
| Total number of hosts per cluster | 1 | 353 (50 shards × 7 hosts + 3 ZooKeeper hosts) |
| Amount of data per host when using network HDD or SSD storage (for Intel Broadwell and Intel Cascade Lake) | 10 GB | 4,096 GB |
| Amount of data per host when using network HDD or SSD storage (for Intel Ice Lake) | 10 GB | 8,192 GB |
| Amount of data per host when using a non-replicated SSD storage or an ultra high-speed network storage with three replicas (SSD) | 93 GB | 16,368 GB |
| Amount of data per host when using local SSD storage (for Intel Broadwell and Intel Cascade Lake) | 100 GB | 1,500 GB |
| Amount of data per host when using local SSD storage (for Intel Ice Lake) | 368 GB | 5888 GB |
| Number of databases per cluster | 1 | 1000 |
Limits on the maximum number of objects
The limits on the maximum number of objects in a cluster have two threshold values:
-
Soft limit: When reached, the
system.warningssystem table will display a warning. -
Hard limit: When reached, creating new objects of this type will end with an error message.
Note
The hard limit threshold only works in ClickHouse® 25.2 and higher.
| Type of limit | Soft limit | Hard limit |
|---|---|---|
| Number of databases | 500 | 1000 |
| Number of tables | 5000 | 10000 |
| Number of views | 5000 | 10000 |
| Number of external dictionaries | 500 | 1000 |
All limits are implemented based on ClickHouse® server settings. You cannot change them.
ClickHouse® is a registered trademark of ClickHouse, Inc.