Key Concepts
The following terms are mainly used in the Ucloud Cloud Memory Redis product. In order to facilitate quick use, the following interpretations are provided:
| Term | Definition/Interpretation |
|---|---|
| Instance name | User-defined name for a Cloud Memory Redis instance. |
| Protocol | A Cloud Memory Redis instance supports the Redis protocol. |
| Model | Cloud Memory Redis instances are classified into master-replica and distributed versions. |
| master-replica version instance | Refers to a Redis version instance with master-replica architecture. Double-node master-replica instances support capacity expansion and contraction, but the expanded capacity and performance are limited. |
| Distributed version instance | Refers to a Redis version instance with shard clusters that can be expanded. The distributed cluster instance has better scalability and performance, but also has certain limitations in terms of features. |
| Resource ID | After users create a Cloud Memory Redis instance, the system automatically generates a resource ID that is globally unique. |
| IP and port | The IP is the internal network address for users to access the Cloud Memory Redis instance, which is automatically generated after the Cloud Memory Redis instance is successfully created. The default port is 6379. |
| Capacity expansion | When the configuration of a Cloud Memory Redis instance cannot support the business, the instance can be expanded. |
| Password | The master-replica version supports password access authentication to further ensure instance security. |
| Configuration upgrade and downgrade | The master-replica version supports autonomous capacity expansion and contraction. |
| Slave DB | The master-replica version supports the creation of read-only instances. A master-replica Redis instance supports up to 5 read-only slave DBs, with one master and one slave node to ensure the high availability of the read-only slave DB. |
| Cross-AZ high availability | The master-replica version of Redis supports high-availability across availability zones, that is, one master and one slave are deployed in different availability zones in the same region to achieve disaster recovery at the availability zone level. |
| Backup zone | The availability zone where the backup database of the master-replica version of Redis is deployed. If the function of cross-availability zone deployment is enabled, users can choose to deploy the backup database in other availability zones in the same region. |
| Attribute | Classified as master, slave; the attribute of a master-replica Redis instance is master, and the attribute of a slave instance of a master-replica Redis is slave. |
| Capacity | The capacity size of a Redis instance created by users. |
