PolarDB is a next-generation relational database that is developed by Alibaba Cloud. PolarDB is compatible with MySQL, PostgreSQL, and Oracle engines. Each Cluster Edition cluster supports a maximum storage capacity of 100 TB. You can scale out nodes in a single PolarDB cluster to a maximum of 16 nodes. PolarDB applies to the various database scenarios of enterprises.
PolarDB uses an architecture where computing is decoupled from storage. All the compute nodes share one set of data. PolarDB allows you to upgrade or downgrade configurations in minutes, and supports fault recovery in seconds. PolarDB ensures global data consistency, and offers free services of data backup and disaster recovery. PolarDB incorporates the highlights of commercial databases: stability, reliability, high performance, and scalability. It also has the advantages of open source cloud databases: ease of use, openness, and self-iteration. PolarDB for MySQL is fully compatible with native MySQL and ApsaraDB RDS for MySQL. You can migrate data from MySQL to PolarDB for MySQL without modifying code or configurations of your applications.
A Cluster Edition cluster contains one primary node and a maximum of 15 read-only nodes. At least one read-only node is required to provide active-active high availability. A cluster ID starts with
pcthat stands for a PolarDB cluster.
A node is a database service process that exclusively occupies physical memory. A node ID starts with
pithat stands for a PolarDB instance.
A database is a logical unit that is created in a node. You can create multiple databases in a node. The name of each database in the node must be unique.
- Region and zone
A region is a physical area where a data center resides. A zone is a physical area in a region. This area has independent power supplies and networks. For more information, see Alibaba Cloud's Global Infrastructure.
Alibaba Cloud offers an easy-to-use web console to help you manage various Alibaba Cloud services and products, including PolarDB. In the console, you can create, connect to, and configure PolarDB databases.
For more information about the console interface, see Alibaba Cloud Management Console.
PolarDB console address: PolarDB console