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Updated on 2022-12-22 GMT+08:00
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DB Instance Types

DB instances are the smallest management units used by RDS. A DB instance is an isolated database environment on the cloud. A DB instance can contain multiple user-created databases, and you can access it using the same tools and applications that you use with a stand-alone DB instance. You can create and modify DB instances using the management console or APIs. RDS does not have limits on the number of running DB instances. Each DB instance has a DB instance identifier.

DB instances are classified into the following types.

Table 1 DB instance types

DB Instance Type

Description

Single

Uses a single-node architecture. More cost-effective than primary/standby DB instances.

Primary/Standby

Uses an HA architecture with one master node and one slave node.

Read replica

Uses a single-node architecture (without a standby node).

You can use RDS to create and manage DB instances running various DB engines.

For details about differences and function comparison between different instance types, see DB Instance Introduction and Function Comparison.

Parent topic: DB Instance Description