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ApsaraDB for Redis:Terms

Last Updated:May 15, 2023

This topic describes the terms of ApsaraDB for Redis.



ApsaraDB for Redis

A high-performance, key-value storage database service that supports caching and storage. ApsaraDB for Redis is developed based on the open source Berkeley Software Distribution (BSD) protocol.

instance ID

A basic unit of ApsaraDB for Redis. Each instance corresponds to a user space. ApsaraDB for Redis has limits on instance configurations, such as the number of connections, bandwidth, and CPU capability. These limits vary based on different instance types. You can view the list of your instance IDs in the Tair console.

standard master-replica instance

A instance that is built on top of a master-replica architecture. Standard master-replica instances provide limited capacity and performance. However, you can change a standard master-replica instance to an instance of another architecture, such as a cluster or read/write splitting instance.

cluster instance

A instance that runs in a cluster architecture with scalability. Cluster instances provide higher scalability and performance. However, the instances provide limited features.


The host address that is used to connect to ApsaraDB for Redis. The endpoint is displayed as a domain name. To obtain the endpoint, log on to the console and choose Instance Information > > Connection Information.

connection password

The password that is used to connect to a instance. The password is in the user:password format.

eviction policy

The eviction policy that is the same as that of ApsaraDB for Redis. For more information, see Key eviction.

database (DB)

Each ApsaraDB for Redis instance can contain up to 256 databases: DB 0 to DB 255. By default, data is written into DB 0.