Compared with user-created databases, ApsaraDB for MongoDB provides more diverse features to remove MongoDB O&M complexities. See the following table.
ApsaraDB for MongoDB provides the following service advantages over user-created databases:
|ApsaraDB for MongoDB||ECS user-created database||Traditional user-created database|
|Availability||Each instance has a three-node copy set. Disaster recovery switch is provided and migration is automated in the case of faults without impact on services and applications.||Manual installation is required, and a multi-node copy set is deployed.||Manual installation is required, and a multi-node copy set is deployed.|
|Reliability||Highly reliable data assurance; automatic backup and one-click data recovery.||Manual installation is required, and a multi-node copy set is deployed. Manual backup and data recovery.||Manual installation is required, and a multi-node copy set is deployed. Manual backup and data recovery.|
|Scalability||Elastic resizing, on-demand upgrade, high resource utilization rate, and upgrade process transparent to users and without service impact.||Manual construction of a scalable architecture and self-assurance of the service impact caused by upgrade.||A relatively long period of resizing deployment. Low resource utilization rate with considerations for peak. Manual construction of a scalable architecture.|
|Low cost||Routine maintenance functions such as resource monitoring and database backup recovery. No O&M investment in machine installation and database deployment.||Database maintenance by full-time DBAs.||Database maintenance by full-time DBAs. Basic O&M by full-time O&M engineers.|