General questions about Managed Service for Redis
-
What part of database management and maintenance is Managed Service for Redis responsible for?
-
Which tasks are best addressed using Managed Service for Redis, and which using VMs with databases?
-
How can I change the computing resources and storage size for a database cluster?
-
When are backups performed? Is a database cluster available during backup?
-
Why is the cluster slow even though the computing resources are not used fully?
What is Managed Service for Redis?
Managed Service for Redis is a service that helps you create, operate, and scale Redis databases in a cloud infrastructure.
With Managed Service for Redis, you can:
- Create a database with the required performance characteristics.
- Scale your processing power and storage size allocated to your databases as needed.
- Get database logs.
Managed Service for Redis takes on time-consuming Redis 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 Redis 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 Redis responsible for?
When creating clusters, Managed Service for Redis allocates resources, installs the DBMS, and creates databases.
For the created and running databases, Managed Service for Redis automatically creates backups and applies fixes and updates to the DBMS.
Managed Service for Redis 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 Redis, and which using VMs with databases?
Yandex Cloud offers two ways to work with databases:
- Managed Service for Redis 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, 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 Redis?
Managed Service for Redis is available to any registered Yandex Cloud user.
To create a database cluster in Managed Service for Redis, you must define its characteristics:
- Host class (performance characteristics, such as CPUs, memory, 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 host.
For a detailed guide, see Getting started with Managed Service for Redis.
How many DB hosts can a cluster contain?
The minimum number of hosts per cluster depends on the following:
- Selected platform and host class.
- Selected disk type.
- Whether you enabled sharding when creating a cluster.
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 Redis.
How can I access a running DB host?
You can connect to Managed Service for Redis databases using standard DBMS methods. However, there is one exception: Managed Service for Redis hosts can only be accessed from Yandex Cloud VMs connected to the same network.
How many clusters can I create within a single cloud?
You can find MDB technical and organizational limitations in Quotas and limits in Managed Service for Redis.
How are DB clusters maintained?
Maintenance in Managed Service for Redis 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 Redis maintenance activities.
For more information, see Maintenance in Managed Service for Redis.
Which Redis version does Managed Service for Redis use?
Managed Service for Redis supports Redis versions 6.2 and 7.0.
What happens when a new DBMS version is released?
The database software is updated when new minor versions are released. 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?
One month after the database version becomes deprecated, Managed Service for Redis 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 for major versions. Deprecated major versions are upgraded even if you disabled automatic updates.
How is the cost of usage calculated for a database host?
In Managed Service for Redis, 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 space in the amount of the reserved storage 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. The cost per hour of operation for each host class is given in Managed Service for Redis pricing.
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.
Is DB host backup enabled by default?
Yes, backup is enabled by default. For Redis, a full backup takes place once a day and saves all DB cluster transaction logs. This allows you to restore the cluster state to any point in time during the backup storage period, except for the last 30 seconds.
By default, backups are stored for seven days.
When are backups performed? Is a DB 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?
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 Redis, you can track:
- Average query execution time
- Number of queries per second
- Number of errors in logs, etc.
Monitoring can be performed with a minimum granularity of 5 seconds.
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 Redis cluster.
For disk.used_bytes
, use notification thresholds. Here are their recommended values:
Alarm
: 90% of disk spaceWarning
: 80% of disk space
The thresholds are only set in bytes. For example, the recommended values for a 100 GB disk are as follows:
Alarm
:96,636,764,160
bytes (90%)Warning
:85,899,345,920
bytes (80%)
on Personal Data
?
Does the service meet the requirements under Russian Federation Federal Law No. 152-FZ Yes, it does. You can read the full security audit conclusion
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?
Cluster logs are stored for 30 days.
Why is a cluster slow although computing resources are not used up?
Likely, the maximum storage IOPS and bandwidth values are insufficient for processing the current number of requests. In this case, throttling occurs, which degrades the entire cluster performance.
The maximum IOPS and bandwidth values increase by a fixed value when the storage size increases by a certain step. The step and increment values depend on the disk type:
Disk type | Step, GB | Max IOPS increase (read/write) | Max bandwidth increase (read/write), MB/s |
---|---|---|---|
network-ssd |
32 | 1,000/1,000 | 15/15 |
network-ssd-nonreplicated |
93 | 28,000/5,600 | 110/82 |
To increase the maximum IOPS and bandwidth values and make throttling less likely, increase the storage size when you update your cluster.
Consider switching to a faster disk type by restoring the cluster from a backup.