ApsaraDB for RDS offers four editions: Basic Edition, High-availability Edition, Cluster Edition, and Enterprise Edition. This topic describes how to view the edition of an RDS instance and provides a comparison between various editions.
For more information about the instance families that are supported by each edition, see Instance families.
View the edition of an RDS instance
Comparison between various editions
|Basic Edition||Your database system consists of only one primary instance, and computing is separated
from storage. This edition is cost-effective.
For more information, see Basic Edition.
|High-availability Edition||Your database system consists of one primary instance and one secondary instance. These instances work in the high-availability architecture. This edition is suitable for more than 80% of the actual business scenarios.||
|Cluster Edition||Your database system consists of one primary instance, one secondary instance, and
up to seven read-only instances that are used to increase the read capability. This
edition is developed based on the AlwaysOn technology. It is supported only for SQL
Server. By default, when you purchase the Cluster Edition, your database system consists
of only a primary instance and a secondary instance. You must purchase read-only instances
later based on your business requirements.
For more information, see Cluster Edition (AlwaysOn Edition).
|Production databases for large- and medium-sized enterprises, such as online retailers, automobile companies, and ERP providers|
|Enterprise Edition||Your database system consists of one primary instance and two secondary instances.
Data is synchronously replicated from the primary instance to the secondary instances.
This allows you to ensure data consistency and finance-level reliability.
For more information, see Enterprise Edition.