Reliability Functions

Cluster HA

RDS supports an HA (primary/standby) architecture, which enables a failover to automatically complete in seconds.

Data Durability

RDS provides 99.9999999% (9 nines) data durability, keeping your data secure and reliable.

Data Backup and Restoration

RDS automatically backs up data every day and stores backups as packages in OBS. The backups can be stored for up to 732 days and can be restored with just a few clicks. You can set a custom backup policy and create manual backups at any time.

You can restore data from backups to any point in time within the backup retention period. In most scenarios, you can use backups to restore data to a new instance or an existing instance at any point in time within 732 days. After the data is verified, data can be migrated back to the primary DB instance.

For details, see Introduction to Backups.

Storage Autoscaling

With storage autoscaling enabled, when RDS detects that you are running out of database space, it automatically scales up your storage.

For details, see Configuring Storage Autoscaling.

Cross-AZ DR

RDS supports cross-AZ high availability. When you buy primary/standby DB instances, you can select different AZs for them.

For details, see Does RDS Support Cross-AZ High Availability?

RDS for MySQL also supports cross-AZ active-active DR within a region using DRS, which is similar to cross-region DR.

Cross-Region DR

You can create a DR instance on the DRS console. If a natural disaster occurs in the region hosting the primary DB instance and both the primary and standby DB instances are unavailable, the DR instance is promoted to the primary DB instance. Then, change the connection address on your applications to the address of the DR instance for service recovery. DRS allows you to perform cross-region single-active or dual-active DR between a primary DB instance and a DR instance during disaster recovery.

For details, see From MySQL to MySQL (Single-Active DR) and From MySQL to MySQL (Dual-Active DR).