|ApsaraDB for Redis||ApsaraDB for Redis is a high-performance key-value storage system that supports caching and storage. The system is developed on the basis of BSD open-source protocols.|
|Instance identifier (ID)||An instance corresponds to a user space, and serves as the basic unit of the ApsaraDB for Redis service. ApsaraDB for Redis has restrictions on instance configurations, such as connections, bandwidth, and CPU processing capacity. These restrictions vary according to different instance types. You can view the list of instance identifiers that you have purchased in the console.|
|Master-replica instance||This is an ApsaraDB for Redis instance that contains a master-replica structure. The master-replica instance provides limited capacity and performance.|
|High-performance cluster instance||This is an ApsaraDB for Redis instance that runs in a scalable cluster architecture. Cluster instances provide better scalability and performance, but they still have limited features.|
|Connection address||This is the host address for connecting to ApsaraDB for Redis. The connection address is displayed as a domain name. To obtain the connection address, choose.|
|Connection password||This is the password used to connect to ApsaraDB for Redis. The password is in the format of Instance ID:custom password. For example, if you set the password as 1234 when you purchase an instance and the allocated instance ID is xxxx, the connection password is xxxx:1234.|
|Eviction policy||This is consistent with the Redis eviction policy. For more information, see http://redis.io/topics/lru-cache.|
|DB||This is the abbreviation of the word database to indicate a database in ApsaraDB for Redis. Each ApsaraDB for Redis instance supports 256 databases numbered DB 0 to DB 255. By default, ApsaraDB for Redis writes data to DB 0.|
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