What types of tree structures are supported in MongoDB?


Parent References   Id of the parent node stored   Child References   Array of child ids stored   Array of Ancestors   Array of ancestor or path id(s) stored
 
Materialized Paths   Ancestor or path id(s) as a string stored.
Suitable for regex processing and partial paths		   Nested Sets   Identifies each node in the tree as stops in a round-trip traversal of the tree. Stores the id of node’s parent, the node’s initial stop in the left field, and its return stop in the right field.
Best for static tree structures



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