MongoDB version 4.0.3 is now also available in the Document Database Service (DDS).
Subsequent versions are dependent on a changed license model and are available on request.
With the introduction of MongoDB 4.0.3 Version a single node deployment will be also supported.
Instance Architecture | Description | Application Scenario |
Cluster | A DDS cluster consists of three types of nodes: Mongos, Shard, and Config. You can configure the number of Mongos and shard nodes as required. Each Mongos is a single node, and each Shard and Config is a three-node replica set. | Cluster instances are recommended for service systems that require both high availability and scalability. |
Replica Set | A Replica Set consists of three nodes: primary, secondary, and hidden. You can operate the primary and secondary nodes directly. High Availability (HA) and Disaster Recovery (DR) switchover are provided and are unnoticeable to applications. | Replica set instance suits small- and medium-sized service systems that require high availability. |
Single Node | A database that is deployed on a single VM does not have the HA feature. To ensure data consistency during full backup, tables are locked to prevent data from being changed. | The single-node architecture features low costs and is a preferred option for R&D and testing environment, learning and training environment, and internal systems of small-sized enterprises. |
Further information can be found in the DDS area of the Help Center.
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