# Global Clusters

Returns, adds, and removes Global Cluster managed namespaces and custom zone mappings. Each collection in a Global Cluster is associated with a managed namespace. When you create a managed namespace for a Global Cluster, MongoDB Cloud creates an empty collection for that namespace. Creating a managed namespace doesn't populate a collection with data. Similarly, deleting a managed namespace doesn't delete the associated collection.
MongoDB Cloud shards the empty collection using the required location field and a custom shard key. For example, if your custom shard key is `city`, the compound shard key is `location, city`. Each Global Cluster is also associated with one or more Global Writes Zones. When a user creates a Global Cluster, MongoDB Cloud automatically maps each location code to the closest geographical zone. Custom zone mappings allow administrators to override these automatic mappings. For example, a use case might require mapping a location code to a geographically distant zone. Administrators can manage custom zone mappings with the APIs below and the **Global Cluster Configuration** pane when you create or modify your Global Cluster.


## Operations
- [Return All Global Clusters Data](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-getgeosharding.md)
- [Add Custom Zone Mappings to One Global Cluster](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-addallcustomzonemappings.md)
- [Remove All Custom Zone Mappings from One Global Cluster](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-deletealllegacycustomzonemappings.md)
- [Create One Managed Namespace in One Global Cluster](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-createlegacymanagednamespace.md)
- [Remove One Managed Namespace from One Global Cluster](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-deletelegacymanagednamespace.md)
- [Remove All Custom Zone Mappings from One Global Cluster](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-deleteallcustomzonemappings.md)
- [Remove One Managed Namespace from One Global Cluster](https://www.mongodb.com/ko-kr/docs/api/doc/atlas-admin-api-v1/operation/operation-deletemanagednamespace.md)

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