This topic provides an overview of ApsaraDB RDS for PPAS and describes related terms.

If you require technical support, log on to the ApsaraDB for RDS console. In the top navigation bar, choose Tickets > Submit Ticket. If your business is complex, you can purchase a support plan to seek advice from instant messaging (IM) enterprise groups, technical account managers (TAMs), and service managers.

For more information about ApsaraDB for RDS, visit the ApsaraDB RDS for MySQL product page.


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ApsaraDB RDS for PPAS is a stable, secure, and scalable enterprise-grade relational database. Based on PostgreSQL, the most advanced open source database in the world, ApsaraDB RDS for PPAS brings enhancements in terms of performance, application solutions, and compatibility. It also provides the capability of directly running Oracle applications. You can run enterprise-grade applications on ApsaraDB RDS for PPAS to implement stable and cost-effective services.

For more information about the features that ApsaraDB RDS for PPAS offers, see Features of ApsaraDB RDS for PPAS.

Basic terms

  • Instance: An instance is a database service process that separately consumes physical memory resources. You can set a specific memory size, disk capacity, and database type. The memory size determines the performance of the instance. After an instance is created, you can change the specifications or delete the instance.
  • Database: A database is a logical unit created on an instance. The name of each database on the same instance must be unique.
  • Region and zone: Each region is a physical data center. Each region contains many isolated locations known as zones. Each zone has an independent power supply and network. For more information, see Alibaba Cloud's Global Infrastructure.

General terms

Term Description
On-premises database A database that is deployed to an on-premises data center or is not deployed on an ApsaraDB for RDS instance.
ApsaraDB RDS for XX (XX represents one of the following database engines: MySQL, SQL Server, PostgreSQL, PPAS, and MariaDB.) ApsaraDB for RDS with a specific database engine. For example, ApsaraDB RDS for MySQL means the database engine of the instance enabled on ApsaraDB for RDS is MySQL.