How do I select specifications and nodes when creating a DDS instance
Before selecting the DDS specification and architecture, you first need to understand the requirements of your application, including the expected read and write load, the size of the data volume, the number of concurrent connections, and the data growth rate. For test scenarios, you can use a single node, which does not have high availability. For small-scale applications, you can use replica sets, which provide high availability but don't scale horizontally and are suitable for scenarios that require data redundancy and failover. For large-scale applications and high-throughput scenarios, horizontal scaling can be achieved using sharding, which allows data to be distributed across multiple nodes, improving the horizontal scalability of the system.
DDS is memory-sensitive because it uses memory to cache data and indexes. Ensure enough memory to hold frequently used data to reduce disk I/O and improve performance. Of course, you can also expand the specifications in future to better meet the business needs.
I can't see the activated instance on the console
If the instance is not visible on the console after creation, you can confirm whether the correct resource pool is selected and the resource pool is located in the upper left corner of the page.
Do I need to use a template to create an instance
DDS does not need to create instance through template. When creating an instance, you can evaluate the business requirements and select the appropriate architecture and specifications to create a DDS that meets your business requirements. After the instance is created, you can also configure parameters and manage roles for your instance.
Why data is lost or deleted
DDS doesn't delete any user data. In the event of data loss, check whether there is any misoperation, and if necessary, you can restore the data through backup files.
Will deleting the cloud account delete the backup of DDS
Deleting the cloud account will simultaneously delete the data backup files.
What is the difference between freezing and unsubscribing from an instance upon expiration
When your instance expires, it will be frozen. During the freezing window, instance data will be retained, but the corresponding DDS cannot be accessed. You can unfreeze the instance through renewal.
When you decide that you no longer need the instance, you can unsubscribe from the instance, and the underlying machine will be recycled and the data will not be retained, so please be cautious when unsubscribing from the instance.