MongoDB MongoDB Data Modeling 2

Question 1

What is the 'computed pattern' in MongoDB data modeling?

Accepted Answer

Pre-computing and storing frequently accessed calculated values in the document

Answer

The computed pattern stores the result of expensive calculations alongside the source data, avoiding repeated computation on every read.

Question 2

What is the 'attribute pattern' in MongoDB schema design?

Accepted Answer

Transforming varied fields into a consistent array of key-value pairs

Answer

The attribute pattern converts documents with many similar but not identical fields into an array of {k, v} subdocuments, making indexing more efficient.

Question 3

In MongoDB schema design, what is the 'extended reference pattern'?

Accepted Answer

Duplicating a subset of frequently accessed fields from the referenced document

Answer

The extended reference pattern stores the _id reference plus a few frequently accessed fields from the related document to reduce join-like operations.

Question 4

What is document validation in MongoDB?

Accepted Answer

Enforcing schema rules on insert and update operations using validation expressions

Answer

MongoDB's document validation uses JSON Schema or query expressions to enforce rules on documents during insert and update operations.

Question 5

What is the 'tree pattern' used for in MongoDB data modeling?

Accepted Answer

Representing hierarchical data structures like org charts or category trees

Answer

The tree pattern represents hierarchical parent-child relationships, with various sub-patterns like parent references, child references, or materialized paths.

MongoDB Practice Test

MongoDB Practice Test

MongoDB MongoDB Data Modeling 2