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Product Specifications
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Last updated: 2024-10-10 11:00:39
Product Specifications
Last updated: 2024-10-10 11:00:39
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This document describes the specifications of replica set and sharded cluster instances supported by TencentDB for MongoDB to help you choose a specification suitable for your business.

Replica Set

Replica quantity

Primary and secondary nodes: A one-primary-two-secondary architecture with three storage nodes is adopted by default. You can select five (one-primary-four-secondary) or seven (one-primary-six-secondary) nodes. Currently, you cannot customize the number of replicas.
Read-only nodes: You can configure 0–5 secondary nodes as read-only nodes.

Mongod specification

General Edition

Note:
The maximum number of connections for a 3-node replica set instance refers to the standard maximum connections for each specification. The single-node connection limit is the maximum limit that can be increased to.
CPU per Node
Memory per Node (GB)
Disk Capacity per Node (GB)
Maximum Connections to Three Nodes
Single-Node Connection Limit
(The actual limit does not exceed the maximum connections for the instance.)
2 cores
4 GB
Default: 250 GB; range: [100,500]
3000
10,000
4 cores
8 GB
Default: 500 GB; range: [150,1000]
6000
6 cores
16 GB
Default: 750 GB; range: [250,1500]
9000
12 cores
32 GB
Default: 1500 GB; range: [500,6000]
12000
15,000
24 cores
64 GB
Default: 2500 GB; range: [800,5000]
18000
24 cores
128 GB
Default: 3000 GB; range: [1500,5000]
21000
32 cores
240 GB
Default: 4000 GB; range: [1500,6000]
42000
20,000
48 cores
512 GB
Default: 4000 GB; range: [1500,6000]
60000

Cloud Edition

CPU per Node
Memory per Node (GB)
Disk Capacity per Node (GB)
Maximum Connections for a 3-node Instance
Single-Node Connection Limit (The actual limit does not exceed the maximum connections for the instance.)
2 cores
4 GB
Default: 250 GB; range: [10,6000]
3000
10,000
4 cores
8 GB
Default: 500 GB; range: [10,6000]
6000
6 cores
16 GB
Default: 750 GB; range: [10,6000]
9000
12 cores
32 GB
Default: 1500 GB; range: [10,6000]
12,000
15,000
24 cores
64 GB
Default: 2500 GB; range: [10,6000]
18,000
24 cores
128 GB
Default: 3000 GB; range: [10,6000]
21,000

Sharded Cluster

Mongod specification

General Edition

CPU per Node
Memory per Shard (GB)
Disk Capacity per Shard (GB)
2 cores
4 GB
Default: 250 GB; range: [100,500]
4 cores
8 GB
Default: 500 GB; range: [150,1000]
6 cores
16 GB
Default: 750 GB; range: [250,1500]
12 cores
32 GB
Default: 1500 GB; range: [500,6000]
24 cores
64 GB
Default: 2500 GB; range: [800,5000]
24 cores
128 GB
Default: 3000 GB; range: [1500,5000]
32 cores
240 GB
Default: 4000 GB; range: [1500,6000]
48 cores
512 GB
Default: 4000 GB; range: [1500,6000]

Cloud Edition

CPU per Node
Memory per Node (GB)
Disk Capacity per Node (GB)
2 cores
4 GB
Default: 250 GB; range: [10,6000]
4 cores
8 GB
Default: 500 GB; range: [10,6000]
6 cores
16 GB
Default: 750 GB; range: [10,6000]
24 cores
128 GB
Default: 3000 GB; range: [100,6000]

Mongod shard quantity

Value range of the number of shards: [2,36].

Node quantity per mongod shard

Primary and secondary nodes: A one-primary-two-secondary architecture with three storage nodes is adopted by default. You can select five (one-primary-four-secondary) or seven (one-primary-six-secondary) nodes. Currently, you cannot customize the number of replicas.
Read-only nodes: You can configure 0–5 secondary nodes as read-only nodes.

Mongos specification

A single-AZ deployed instance can contain 3–32 nodes.
A multi-AZ deployed instance can contain 6–32 instances.
Mongos Specification
Maximum Connections per Mongos Node
1-core 2 GB MEM
1000
2-core 4 GB MEM
2000
4-core 8 GB MEM
4000
8-core 16 GB MEM
8000
16-core 32 GB MEM
16000

configServer specification

The default configServer specification is 1-core 2 GB with 20 GB storage and three replicas, which cannot be modified.

User Name for Instance Connection

TencentDB for MongoDB comes with a default user: "mongouser". It supports the SCRAM-SHA-1 authentication mechanism, and its role is readWriteAnyDatabase+dbAdmin. You can use it to read and write any database, but are not permitted to perform high-risk operations.
TencentDB for MongoDB v3.2 supports another default user: "rwuser". It uses the MONGODB-CR authentication mechanism which, however, has been no longer supported by MongoDB. We recommend that you use the "mongouser" to connect to your instance.
You can also manage your account and permissions as needed in the TencentDB for MongoDB console.

Avoiding Filling Up Disk

If the disk usage of an instance has reached 100%, you cannot write to it. You need to adjust the instance specification in time or contact us for assistance. For more information, see Adjusting Instance Specification.
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