Database instance: A type of virtual database server that consists of various high-speed buffer pools and background processes.
User-created database in an on-premises data center: A database instance that is deployed in a non-cloud environment, such as an on-premises data center or a hosted data center.
User-created database on an Elastic Compute Service (ECS) instance: A database instance that is deployed on Alibaba Cloud ECS.
Group: A collection of one or more database instances that have the same database engine, such as MySQL, Oracle, or SQL Server. A database instance can belong to only one group.
DBGateway: A daemon process that is deployed in your environment. It is responsible for collecting and processing database performance data. It does not read business data, and it encrypts and compresses data during transmission.
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