PolarDB is a next-generation cloud-based service developed by Alibaba Cloud for relational databases, which is compatible with MySQL, PostgreSQL, and Oracle. Based on a distributed storage architecture, PolarDB provides high-capacity, low-latency online transaction processing (OLTP) services, and cost-effective scalable services.
A PolarDB cluster contains one primary instance and up to 15 read-only instances (at least one read-only instance must be provided to guarantee active-active high availability support). A PolarDB cluster ID starts with pc, which stands for PolarDB cluster.
An instance is an independent database server in which you can create and manage multiple databases. An instance ID starts with pi, which stands for PolarDB instance.
A database is a logical unit created in an instance. The name of each PolarDB database under the same instance must be unique.
- Region and zone
Each region is a separate geographic area. Zones are distinct locations within a region that operate on independent power grids and networks. For more information, see Alibaba Cloud's Global Infrastructure.
Alibaba Cloud offers a web-based and easy-to-use console where you can manage various products and services including PolarDB. In the console, you can create, access, and configure your PolarDB database.
For more information about the console layout, see Alibaba Cloud console.