TencentDB for MongoDB involves the following concepts:
Instance: a standalone database environment running in Tencent Cloud. A TencentDB instance includes multiple databases created by users.
Replica set: a primary-secondary cluster supporting automatic failover and consisting of a primary node and one or more secondary nodes.
Sharded cluster: a sharded cluster consists of components such as shards, proxy sets, and config servers. Each shard contains a subset of sharded data. Each shard in TencentDB for MongoDB is deployed as a replica set.
VPC: a logically isolated custom virtual network space in Tencent Cloud.
Security group: security access control to TencentDB for MongoDB instances by specifying IP, protocol, and port rules for instance access.
Region and availability zone: physical location of a TencentDB for MongoDB instance and other resources.
Tencent Cloud console: web-based UIs.
Project: projects enable developers to better manage Tencent Cloud services based on the concept of projects by assigning different Tencent Cloud services to different projects.