Terms
This topic describes the terms that are used in MongoDB.
| No. | Term | Description |
|---|---|---|
| 1 | instance | An MongoDB instance, which is the basic unit of MongoDB. |
| 2 | memory | The maximum memory that an instance can use. |
| 3 | disk capacity | The disk size that you select when you create an MongoDB instance. |
| 4 | IOPS | The maximum number of read/write operations performed per second on block devices at a granularity of 4 KB. |
| 5 | CPU core | The maximum computing power of an MongoDB instance. A single Intel Xeon series CPU core has at least 2.3 GHz of computing power with hyper-threading capabilities. |
| 6 | mongos | The routing service that processes requests. All requests must be coordinated by using mongos that serves as a request distribution center and forwards data requests to the corresponding shard serve |
| 7 | shard | An MongoDB instance that holds a subset of the sharded data. |
| 8 | configserver | A configuration server that stores all database metadata for mongos nodes and shards in an MongoDB sharded cluster instance. Mongos nodes cache shard data and data routing information in their memory, whereas Configservers store such data. |