When using references, the growth of the relationships determine where to store the reference.

The use of the term chunks in the context of GridFS is not related to the use of the term chunks in the context of sharding.

Normalized data models can require more round trips to the server.

In MongoDB, write operations, e.g. db.collection.update(), db.collection.findAndModify(), db.collection.remove(), are atomic on the level of a single document.

MongoDB documents make it possible to embed document structures in a field or array within a document.

An array with a large number of elements, such as one with several hundreds or thousands of keywords will incur greater indexing costs on insertion.

Arbitrary Precision which uses two fields for the value: one field to store the exact monetary value as a non-numeric and another field to store a floating point approximation of the value.

In addition to the tree node, document stores in an array the id(s) of the node's children.

Applications that must operate or report on some unmodified local time value may store the time zone alongside the UTC times tamp, and compute the original local time in their application logic.

The Array of Ancestors pattern stores each tree node in a document; in addition to the tree node, document stores in an array the id (s) of the node's ancestors or path.