General questions about Managed Service for MongoDB

• What is Managed Service for MongoDB?

• What part of database management and maintenance is Managed Service for MongoDB responsible for?

• Which tasks are best addressed using Managed Service for MongoDB, and which using VMs with databases?

• What is a database host and database cluster?

• How do I get started with Managed Service for MongoDB?

• How many database hosts can a cluster contain?

• How can I access a running database host?

• How many clusters can I create within a single cloud?

• How are DB clusters maintained?

• Which MongoDB version does Managed Service for MongoDB use?

• What happens when a new DBMS version is released?

• What happens when a DBMS version becomes deprecated?

• How is usage cost calculated for a database host?

• How can I change the computing resources and storage size for a database cluster?

• Is database host backup enabled by default?

• When are backups performed? Is a database cluster available during backup?

• What metrics and processes can be tracked using monitoring?

• How do I set up an alert that triggers as soon as a certain percentage of disk space has been used up?

What is Managed Service for MongoDB?What is Managed Service for MongoDB?

Managed Service for MongoDB is a service that helps you create, operate, and scale MongoDB databases in a cloud infrastructure.

With Managed Service for MongoDB, you can:

• Create a database with the required performance characteristics.
• Scale processing power and storage dedicated for your databases.
• Get database logs.

Managed Service for MongoDB takes on time-consuming MongoDB 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 MongoDB the same way you interact with regular databases in your local infrastructure. This allows you to manage internal database settings to meet your app requirements.

What part of database management and maintenance is Managed Service for MongoDB responsible for?What part of database management and maintenance is Managed Service for MongoDB responsible for?

When you create clusters, Managed Service for MongoDB allocates resources, installs the DBMS, and creates databases.

For the created and running databases, Managed Service for MongoDB automatically creates backups and applies fixes and updates to the DBMS.

Managed Service for MongoDB 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 are best addressed using Managed Service for MongoDB, and which using VMs with databases?Which tasks are best addressed using Managed Service for MongoDB, and which using VMs with databases?

Yandex Cloud offers two ways to work with databases:

• Managed Service for MongoDB allows you to operate template databases with no need to worry about administration.
• Yandex 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, and so on.

What is a database host and database cluster?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 MongoDB?How do I get started with Managed Service for MongoDB?

Managed Service for MongoDB is available to any registered Yandex Cloud user.

To create a database cluster in Managed Service for MongoDB, you need to define its parameters:

• Host class (performance characteristics, such as CPUs, RAM, etc.).
• Disk type and size (reserved in full when creating a cluster).
• Network your cluster will be connected to.
• Number of hosts for the cluster and the availability zone for each of them.

For detailed instructions, see Getting started with Managed Service for MongoDB.

How many database hosts can there be in one cluster?How many database hosts can there be in one cluster?

The minimum number of hosts per cluster depends on the following:

• Selected platform and host class.
• Selected disk type.

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.

How can I access a running DB host?How can I access a running DB host?

You can connect to Managed Service for MongoDB databases using standard DBMS methods.

Learn more about connecting to clusters.

How many clusters can I create within a single cloud?How many clusters can I create within a single cloud?

For more information on MDB technical and organizational limitations, see Quotas and limits.

How are DB clusters maintained?How are DB clusters maintained?

In Managed Service for MongoDB, maintenance 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 MongoDB maintenance activities.

For more information, see Maintenance.

Which MongoDB version does Managed Service for MongoDB use?Which MongoDB version does Managed Service for MongoDB use?

Managed Service for MongoDB supports MongoDB versions 5.0 and 6.0 Community Edition.

What happens when a new DBMS version is released?What happens when a new DBMS version is released?

When new minor versions are released, the cluster software is updated after a short testing period. Owners of the affected DB clusters are notified of expected work times and DB availability in advance.

What happens when a DBMS version becomes deprecated?What happens when a DBMS version becomes deprecated?

One month after the database version becomes deprecated, Managed Service for MongoDB automatically sends email notifications to the owners of DB clusters created with this version.

New hosts can no longer be created using deprecated DBMS versions. Database clusters are automatically upgraded to the next supported version seven days after notification for minor versions and one month after notification for major versions. Deprecated major versions are going to be upgraded even if you have disabled automatic updates.

How do you calculate usage cost for a database host?How do you calculate usage cost for a database host?

In Managed Service for MongoDB, the usage cost is calculated based on the following parameters:

• Selected host class.
• Size of the storage reserved for the database host.
• Size of the database cluster backups. Backup size equal to the storage size is free of charge. Backup storage that exceeds this size is charged at special rates.
• Number of hours of database host operation. Partial hours are rounded to an integer value. You can find the cost per hour for each host class in the Pricing policy section.

How can I change the computing resources and storage size for a database cluster?How can I change the computing resources and storage size for a database cluster?

You can change computing resources and storage size from 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.

Is database host backup enabled by default?Is database host backup enabled by default?

Yes, backup is enabled by default. For MongoDB, a full backup is performed once a day with the possibility to restore it to any saved backup.

By default, backups are stored for seven days.

When are backups performed? Is a database cluster available during backup?When are backups performed? Is a database cluster available during backup?

The backup window is an interval during which a full daily backup of the DB cluster is performed. The backup window is from 01:00 to 05:00 (UTC+3).

Clusters remain fully accessible during the backup window.

What metrics and processes can be tracked using monitoring?What metrics and processes can be tracked using monitoring?

For all DBMS types, you can track:

• CPU, memory, network, or disk usage, in absolute terms.
• Memory, network, or disk usage as a percentage of the set limits for the corresponding cluster host class.
• Amount of data in the DB cluster and the remaining free space in the data storage.

For DB hosts, you can track metrics specific to the corresponding type of DBMS. For example, for MongoDB, you can track:

• Number of queries per second.
• Amount of disk space used.
• Number of connections, and so on.

Monitoring can be performed with a minimum granularity of five seconds.

How do I set up an alert that triggers as soon as a certain percentage of disk space has been used up?How do I set up an alert that triggers as soon as a certain percentage of disk space has been used up?

Create an alert with the disk.used_bytes metric in Yandex Monitoring. This metric shows the disk space usage in the Managed Service for MongoDB cluster.

For disk.used_bytes, use notification thresholds. The recommended values are as follows:

• Alarm: 90% of the disk space
• Warning: 70% of the disk space

Thresholds are set in bytes only. For example, the recommended values for a 100 GB disk are as follows:

• Alarm: 96636764160 bytes (90%)
• Warning: 75161927680 bytes (70%)

Does the service meet the requirements under Russian Federation Federal Law No. 152-FZ on Personal Data?Does the service meet the requirements under Russian Federation Federal Law No. 152-FZ on Personal Data?

Yes, it does. You can read the full security audit conclusion.

Can I get logs of my operations with services?Can I get logs of my operations with services?

Yes, you can request log records about your resources from Yandex Cloud services. For more information, see Data requests.

What is the retention period for logs?What is the retention period for logs?

Cluster logs are stored for 30 days.