Use Limits

Last updated: 2020-08-05 10:49:25


    Rocks and WiredTiger engines are supported.

    Replica Set and Sharded Cluster

    There are two options when you create a TencentDB for MongoDB instance:

    Node Configuration Description
    Replica set An instance has 1 primary node and 2 secondary nodes.
    Sharded cluster An instance has at least 2 shards, and each shard has at least 3 nodes. You can expand the specifications of shard nodes, but cannot add shards or nodes.

    Limit on Number of Connections

    MEM Specification Max Connections
    2 GB 1,500
    4 GB 2,000
    6 GB 2,500
    8 GB 3,500
    16 GB 6,000
    24 GB 8,000
    32 GB 9,500
    64 GB 16,000
    128 GB 18,000
    240 GB 18,000
    512 GB 20,000


    For a replica set instance, the maximum number of connections applies to the whole instance instead of a node; for a sharded cluster instance, it applies to a shard.

    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 using the "mongouser" to connect to your instance.

    You can also manage your account and permissions as needed in the MongoDB Console.

    Avoiding Filling Up Disk

    If the disk usage of an instance has reached 100%, you cannot write to it. Please adjust the instance specifications in time as needed. For more information, please see Adjusting Instance Specification.

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