General questions about Managed Service for ClickHouse
What is Managed Service for ClickHouse?
Managed Service for ClickHouse is a service that helps you create, operate, and scale ClickHouse databases in a cloud infrastructure.
With Managed Service for ClickHouse, you can:
- Create a database with the required performance characteristics.
- Scale processing power and storage dedicated for your databases as needed.
- Get database logs.
Managed Service for ClickHouse takes on time-consuming ClickHouse infrastructure administration tasks:
- Monitors resource usage.
- Automatically creates DB backups.
- Provides fault tolerance through automatic failover to backup replicas.
- Keeps database software updated.
You interact with database clusters in Managed Service for ClickHouse the same way you interact with regular databases in your local infrastructure. This allows you to manage internal database settings to meet your app's requirements.
What is ClickHouse used for? Which database should I select?
ClickHouse is designed primarily for analytics (OLAP) and only supports adding and reading data. You can update data but with limitations
What part of database management and maintenance is Managed Service for ClickHouse responsible for?
When creating clusters, Managed Service for ClickHouse allocates resources, installs the DBMS, and creates databases.
For the created and running databases, Managed Service for ClickHouse automatically creates backups and applies fixes and updates to the DBMS.
Managed Service for ClickHouse also provides data replication between database hosts (both inside and between availability zones) and automatically switches the load over to a backup replica in the event of a failure.
Which tasks should I use Managed Service for ClickHouse for and for which VMs with databases?
Nebius AI offers two ways to work with databases:
- Managed Service for ClickHouse allows you to operate template databases with no need to worry about administration.
- Compute Cloud virtual machines allow you to create and configure your own databases. This approach allows you to use any database management systems, access databases via SSH, etc.
What is a database host and database cluster?
A database host is an isolated database environment in the cloud infrastructure with dedicated computing resources and reserved data storage.
A database cluster is one or more database hosts between which replication can be configured.
How do I get started with Managed Service for ClickHouse?
Managed Service for ClickHouse is available to any registered Nebius AI user.
To create a database cluster in Managed Service for ClickHouse, you must define its characteristics:
- Host class (performance characteristics such as CPUs, memory, and so on).
- Storage size (reserved in full when you create the cluster).
- The network your cluster will be connected to.
- The number of hosts for the cluster and the availability zone for each host.
For detailed instructions, see Getting started with Managed Service for ClickHouse.
How many DB hosts can a cluster contain?
You can create a cluster with as little as one host.
The maximum number of hosts in a cluster is only limited by the requested computing resources and the size of the storage for the cluster.
For more information, see Quotas and limits in Managed Service for ClickHouse.
How can I access a running DB host?
You can connect to Managed Service for ClickHouse databases using standard DBMS methods.
Learn more about connecting to clusters.
How many clusters can I create within a single cloud?
MDB technical and organizational limits are given in Quotas and limits in Managed Service for ClickHouse.
How do I maintain database clusters?
Maintenance in Managed Service for ClickHouse implies:
- Automatic installation of DBMS updates and revisions for DB hosts (including disabled clusters).
- Changes to the host class and storage size.
- Other Managed Service for ClickHouse maintenance activities.
For more information, see Maintenance in Managed Service for ClickHouse.
Which version of ClickHouse does Managed Service for ClickHouse use?
Managed Service for ClickHouse supports ClickHouse 23.8 LTS. For more information, see ClickHouse versioning policy.
Which ClickHouse version should I choose?
We recommend ClickHouse 23.8 LTS. For more information, see ClickHouse versioning policy.
What happens when a new DBMS version is released?
When new minor versions are released, the cluster software is automatically updated after a short testing period.
The owners of the affected DB clusters receive advanced notice of expected work times and DB availability.
What happens when a DBMS version becomes deprecated?
When a DBMS version becomes deprecated, Managed Service for ClickHouse automatically sends email notifications to the owners of database clusters created with this version.
New hosts can no longer be created using deprecated DBMS versions. Clusters on a deprecated version of ClickHouse are updated according to the versioning policy.
The owners of the affected DB clusters receive advanced notice of expected work times and DB availability.
How can I change the computing resources and storage size for a database cluster?
You can change computing resources and storage size in the management console. All you need to do is choose a different host class for the required cluster.
The cluster characteristics change within 30 minutes. During this period, other maintenance activities may also be enabled for the cluster, such as installing updates.
Can I get logs of my operations with services?
Yes, you can request log records about your resources from Nebius AI services. For more information, see Data requests.