Help Center/ Document Database Service/ Service Overview/ Instances/ Instance Specifications/ Cluster
Updated on 2026-08-17 GMT+08:00
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Cluster

Instances of the same type have different memory specifications. You can select instances of different specifications based on application scenarios.

This section describes cluster instance specifications. The instance specifications depend on the selected CPU model.

The default maximum number of connections has been adjusted. Query the number of connections based on the instance's creation time. For details about the number of connections for instances created before July 2021, see Historical Node Specifications.

Node Specifications

DDS cluster instances have two specification types: general-purpose and enhanced II. For details, see Table 1.

Table 1 Specification type

Specification Type

Description

Application Scenario

General-purpose

CPU resources are shared with other general-purpose DB instances on the same physical machine. CPU usage is maximized through resource overcommitment. This instance class is a cost-effective option and suitable for scenarios where performance stability is not critical.

Suitable for scenarios that have high requirements on cost-effectiveness.

Enhanced II

With a leading network acceleration engine and Data Plane Development Kit (DPDK) fast packet processing mechanism, this instance class provides higher network performance and computing power.

Suitable for websites and web applications that require high database compute and network performance.
Table 2 config specifications

CPU Type

Specifications

vCPUs

Memory (GB)

Flavor ID

Default Maximum Number of Connections

Range of Connections

x86

General-purpose

2

4

dds.mongodb.s6.large.2.config

2000

200-2000

4

8

dds.mongodb.s6.xlarge.2.config

4000

200-4000

8

16

dds.mongodb.s6.2xlarge.2.config

4000

200-4000

Enhanced II

2

4

dds.mongodb.c6.large.2.config

2000

200-2000

4

8

dds.mongodb.c6.xlarge.2.config

4000

200-4000

8

16

dds.mongodb.c6.2xlarge.2.config

4000

200-4000

Kunpeng

-

2

4

dds.mongodb.large.arm2.config

2000

200-2000

4

8

dds.mongodb.xlarge.arm2.config

4000

200-4000

8

16

dds.mongodb.2xlarge.arm2.config

16000

200-16000
Table 3 dds mongos and shard specifications

CPU Type

Specifications

Component

vCPUs

Memory (GB)

Flavor ID

Default Maximum Number of Connections

Range of Connections

x86

General-purpose

dds mongos

1

4

dds.mongodb.s6.medium.4.mongos

1000

200-21000

2

4

dds.mongodb.s6.large.2.mongos

2000

200-21000

2

8

dds.mongodb.s6.large.4.mongos

2000

200-21000

4

8

dds.mongodb.s6.xlarge.2.mongos

4000

200-21000

4

16

dds.mongodb.s6.xlarge.4.mongos

4000

200-21000

8

16

dds.mongodb.s6.2xlarge.2.mongos

16000

200-21000

8

32

dds.mongodb.s6.2xlarge.4.mongos

16000

200-21000

shard

1

4

dds.mongodb.s6.medium.4.shard

1000

200-21000

2

4

dds.mongodb.s6.large.2.shard

2000

200-21000

2

8

dds.mongodb.s6.large.4.shard

2000

200-21000

4

8

dds.mongodb.s6.xlarge.2.shard

4000

200-21000

4

16

dds.mongodb.s6.xlarge.4.shard

4000

200-21000

8

16

dds.mongodb.s6.2xlarge.2.shard

16000

200-21000

8

32

dds.mongodb.s6.2xlarge.4.shard

16000

200-21000

Enhanced II

dds mongos

2

8

dds.mongodb.c6.large.4.mongos

2000

200-21000

4

16

dds.mongodb.c6.xlarge.4.mongos

4000

200-21000

8

32

dds.mongodb.c6.2xlarge.4.mongos

16000

200-21000

16

64

dds.mongodb.c6.4xlarge.4.mongos

16000

200-21000

32

128

dds.mongodb.c6.8xlarge.4.mongos

16000

200-21000

64

256

dds.mongodb.c6.16xlarge.4.mongos

16000

200-21000

shard

2

8

dds.mongodb.c6.large.4.shard

2000

200-21000

2

16

dds.mongodb.c6.large.8.shard

2000

200-21000

4

16

dds.mongodb.c6.xlarge.4.shard

4000

200-21000

4

32

dds.mongodb.c6.xlarge.8.shard

4000

200-21000

8

32

dds.mongodb.c6.2xlarge.4.shard

16000

200-21000

8

64

dds.mongodb.c6.2xlarge.8.shard

16000

200-21000

16

64

dds.mongodb.c6.4xlarge.4.shard

16000

200-21000

16

128

dds.mongodb.c6.4xlarge.8.shard

16000

200-21000

32

128

dds.mongodb.c6.8xlarge.4.shard

16000

200-21000

32

256

dds.mongodb.c6.8xlarge.8.shard

16000

200-21000

64

256

dds.mongodb.c6.16xlarge.4.shard

16000

200-21000

Kunpeng

-

dds mongos

2

4

dds.mongodb.large.arm2.mongos

2000

200-21000

-

2

8

dds.mongodb.large.arm4.mongos

2000

200-21000

-

4

8

dds.mongodb.xlarge.arm2.mongos

4000

200-21000

-

4

16

dds.mongodb.xlarge.arm4.mongos

4000

200-21000

-

8

16

dds.mongodb.2xlarge.arm2.mongos

16000

200-21000

-

8

32

dds.mongodb.2xlarge.arm4.mongos

16000

200-21000

-

16

32

dds.mongodb.4xlarge.arm2.mongos

16000

200-21000

-

16

64

dds.mongodb.4xlarge.arm4.mongos

16000

200-21000

-

shard

2

4

dds.mongodb.large.arm2.shard

2000

200-21000

-

2

8

dds.mongodb.large.arm4.shard

2000

200-21000

-

4

8

dds.mongodb.xlarge.arm2.shard

4000

200-21000

-

4

16

dds.mongodb.xlarge.arm4.shard

4000

200-21000

-

8

16

dds.mongodb.2xlarge.arm2.shard

16000

200-21000

-

8

32

dds.mongodb.2xlarge.arm4.shard

16000

200-21000

-

16

32

dds.mongodb.4xlarge.arm2.shard

16000

200-21000

-

16

64

dds.mongodb.4xlarge.arm4.shard

16000

200-21000

-

32

64

dds.mongodb.8xlarge.arm2.shard

16000

200-21000

-

32

128

dds.mongodb.8xlarge.arm4.shard

16000

200-21000

-

64

128

dds.mongodb.16xlarge.arm2.shard

16000

200-21000

-

64

256

dds.mongodb.16xlarge.arm4.shard

16000

200-21000

Historical Node Specifications

For details about the range of connections of instances created before July 2021, see the following table.

Table 4 config specifications

Instance Type

CPU Type

Specifications

vCPUs

Memory (GB)

Flavor ID

Default Maximum Number of Connections

Range of Connections

Cluster

x86

General-purpose

2

4

dds.mongodb.s6.large.2.config

400

200-2000

Enhanced

2

4

dds.mongodb.c3.large.2.config

Enhanced II

2

4

dds.mongodb.c6.large.2.config

Kunpeng

-

2

4

dds.mongodb.large.arm2.config
Table 5 dds mongos and shard specifications

Instance Type

CPU Type

Specifications

Component

vCPUs

Memory (GB)

Flavor ID

Default Maximum Number of Connections

Range of Connections

Cluster

x86

General-purpose

dds mongos

1

4

dds.mongodb.s6.medium.4.mongos

400

200-1000

2

4

dds.mongodb.s6.large.2.mongos

400

200-2000

2

8

dds.mongodb.s6.large.4.mongos

400

200-2000

4

8

dds.mongodb.s6.xlarge.2.mongos

1000

200-4000

4

16

dds.mongodb.s6.xlarge.4.mongos

1000

200-4000

8

16

dds.mongodb.s6.2xlarge.2.mongos

4000

200-16000

8

32

dds.mongodb.s6.2xlarge.4.mongos

4000

200-16000

shard

1

4

dds.mongodb.s6.medium.4.shard

400

200-1000

2

4

dds.mongodb.s6.large.2.shard

400

200-2000

2

8

dds.mongodb.s6.large.4.shard

400

200-2000

4

8

dds.mongodb.s6.xlarge.2.shard

1000

200-4000

4

16

dds.mongodb.s6.xlarge.4.shard

1000

200-4000

8

16

dds.mongodb.s6.2xlarge.2.shard

4000

200-16000

8

32

dds.mongodb.s6.2xlarge.4.shard

4000

200-16000

Enhanced

dds mongos

2

8

dds.mongodb.c3.large.4.mongos

400

200-2000

4

16

dds.mongodb.c3.xlarge.4.mongos

1000

200-4000

8

32

dds.mongodb.c3.2xlarge.4.mongos

4000

200-16000

16

64

dds.mongodb.c3.4xlarge.4.mongos

8000

200-16000

32

128

dds.mongodb.c3.8xlarge.4.mongos

8000

200-16000

60

256

dds.mongodb.c3.15xlarge.4.mongos

8000

200-16000

shard

2

8

dds.mongodb.c3.large.4.shard

400

200-2000

4

16

dds.mongodb.c3.xlarge.4.shard

1000

200-4000

8

32

dds.mongodb.c3.2xlarge.4.shard

4000

200-16000

16

64

dds.mongodb.c3.4xlarge.4.shard

8000

200-16000

32

128

dds.mongodb.c3.8xlarge.4.shard

8000

200-16000

60

256

dds.mongodb.c3.15xlarge.4.shard

8000

200-16000

Enhanced II

dds mongos

2

8

dds.mongodb.c6.large.4.mongos

400

200-2000

4

16

dds.mongodb.c6.xlarge.4.mongos

1000

200-4000

8

32

dds.mongodb.c6.2xlarge.4.mongos

4000

200-16000

16

64

dds.mongodb.c6.4xlarge.4.mongos

8000

200-16000

32

128

dds.mongodb.c6.8xlarge.4.mongos

8000

200-16000

64

256

dds.mongodb.c6.16xlarge.4.mongos

8000

200-16000

shard

2

8

dds.mongodb.c6.large.4.shard

400

200-2000

4

16

dds.mongodb.c6.xlarge.4.shard

1000

200-4000

8

32

dds.mongodb.c6.2xlarge.4.shard

4000

200-16000

16

64

dds.mongodb.c6.4xlarge.4.shard

8000

200-16000

32

128

dds.mongodb.c6.8xlarge.4.shard

8000

200-16000

64

256

dds.mongodb.c6.16xlarge.4.shard

8000

200-16000

Kunpeng

-

dds mongos

2

4

dds.mongodb.large.arm2.mongos

400

200-2000

-

2

8

dds.mongodb.large.arm4.mongos

400

200-2000

-

4

8

dds.mongodb.xlarge.arm2.mongos

1000

200-4000

-

4

16

dds.mongodb.xlarge.arm4.mongos

1000

200-4000

-

8

16

dds.mongodb.2xlarge.arm2.mongos

4000

200-16000

-

8

32

dds.mongodb.2xlarge.arm4.mongos

4000

200-16000

-

16

32

dds.mongodb.4xlarge.arm2.mongos

8000

200-16000

-

16

64

dds.mongodb.4xlarge.arm4.mongos

8000

200-16000

-

shard

2

4

dds.mongodb.large.arm2.shard

400

200-2000

-

2

8

dds.mongodb.large.arm4.shard

400

200-2000

-

4

8

dds.mongodb.xlarge.arm2.shard

1000

200-4000

-

4

16

dds.mongodb.xlarge.arm4.shard

1000

200-4000

-

8

16

dds.mongodb.2xlarge.arm2.shard

4000

200-16000

-

8

32

dds.mongodb.2xlarge.arm4.shard

4000

200-16000

-

16

32

dds.mongodb.4xlarge.arm2.shard

8000

200-16000

-

16

64

dds.mongodb.4xlarge.arm4.shard

8000

200-16000

Helpful Links

How Do I Change the Maximum Number of Connections for a Cluster Instance?

You can change the maximum number of connections to a DB instance by modifying the net.maxIncomingConnections parameter. For details about how to change parameter values, see Modifying DDS DB Instance Parameters.

How Do I Purchase a Cluster Instance?

For details, see Buying a Cluster Instance.

How Do I Change the CPUs and Memory of a Cluster Instance?

You can change the CPU and memory of dds mongos and shard nodes. For details, see Changing the CPU and Memory of a Cluster Instance.

How Do I Scale Up Storage of a Cluster Instance?

You can scale up the storage of shard nodes. For details, see Scaling Up Storage.

Parent Topic: Instance Specifications