This topic describes general-purpose, dedicated-disk, and dedicated-host instance categories of ApsaraDB for MongoDB.


Category Description Scenario
  • General-purpose instances on the same physical server occupy dedicated memory and storage but share CPU and I/O resources.
  • CPU resources are highly reused among shared instances that are deployed on the same physical server. This maximizes cost-effectiveness.
  • Price-sensitive scenarios.
  • Scenarios that require a baseline level of performance stability.
  • Dedicated local-disk instances on the same physical server occupy dedicated memory, storage, and CPU resources but share I/O resources.
  • Dedicated cloud-disk instances occupy dedicated memory, storage, CPU, and I/O resources. Therefore, dedicated cloud-disk instances provide higher performance and stability and is less affected by other instances that are deployed on the same physical server than dedicated local-disk instances.

The top configuration of this category is a dedicated-host instance, which exclusively occupies all resources on a physical server.

Business scenarios where databases are used as core systems, such as finance, e-commerce, government affairs, and large and medium-sized Internet services.
The following figure shows the differences between general-purpose instances, dedicated local-disk instances, and dedicated cloud-disk instances.Comparison between ApsaraDB for MongoDB instance categories

Instance specifications

For more information about instance specifications such as the number of vCPUs, memory, storage capacity, maximum number of connections, and IOPS, see Instance types.


For more information about the pricing of each instance type, see Billing items and pricing.

Change instance specifications

You can change the specifications of an instance. For more information about specific operations, see Configuration change overview.