Questions about MySQL®

• What MySQL® versions does Managed Service for MySQL® support?

• Is database cluster backup enabled by default?

• Are MySQL® database cluster connections encrypted?

• What is a read-only replica in MySQL®?

• What limitations are imposed on MySQL® database clusters?

• Why is the cluster slow even though the computing resources are not used fully?

What MySQL® versions does Managed Service for MySQL® support?What MySQL® versions does Managed Service for MySQL® support?

Managed Service for MySQL® supports MySQL® 5.7 and MySQL® 8.

Are DB cluster backups enabled by default?Are DB cluster backups enabled by default?

Yes, backup is enabled by default. For MySQL® clusters, 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.

Are MySQL® database cluster connections encrypted?Are MySQL® database cluster connections encrypted?

Connections between a database cluster and an application are always encrypted using SSL. You cannot disable cluster connection encryption.

What is a read-only replica in MySQL®?What is a read-only replica in MySQL®?

A read-only replica is a host in a MySQL® DB cluster that can only be read. Its data is synced with the master host (if the cluster has more than one host). You can use a read-only replica to reduce the load on the DB master host with a large number of read requests.

What limitations are imposed on MySQL® database clusters?What limitations are imposed on MySQL® database clusters?

For more information on Managed Service for MySQL® limits, see Quotas and limits. To learn about the properties of the clusters you can create using Managed Service for MySQL®, see Host classes.

Why is the cluster slow even though the computing resources are not used fully?Why is the cluster slow even though the computing resources are not used fully?

Your storage may have insufficient maximum IOPS and bandwidth to process 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:

To increase the maximum IOPS and bandwidth values and make throttling less likely, increase the storage size when you update your cluster.

If you are using the network-hdd storage type, consider switching to network-ssd or network-ssd-nonreplicated by restoring the cluster from a backup.