Mongodb

MongoDB is one of the leading NoSQL databases?

• False

• True

  
  

MongoDB indexes use a _______ data structure.

• 
  B-tree

  
  

• All of the mentioned

• Hash

• Map

Consider a one-to-many relationship observed between a county and the cities in that county. Which of the following are valid ways to represent this one-to-many relationship with the document model in MongoDB?

• document having a field to reference the document of its county.

• 
  Embed the entities for the cities as an array of sub-documents in the corresponding county document.

• Embed all the fields for a city as a subdocument in the corresponding county document.

Which of the following is not part of the first phase of the data modeling methodology?

• Identifying the durability of each write operation.

  
  

• 
  Listing the write operations.

• 
  Listing the read operations.

• Quantifying each of the operations in terms of latency and frequency

• Identifying the relationships between the units of data.

_______ scaling adds more CPU and storage resources to increase capacity.

• All of the mentioned

• 
  Horizontal

• 
  Vertical

  
  

• 
  Partition

Which of the following pattern is best for static trees that do not change?

• 
  Root

  
  

• Parent

  
  

• Child

• None of the mentioned

The ________ References pattern stores each tree node in a document; in addition to the tree node, the document stores the id of the node’s parent.

• 
  Root

• Child

• None of the mentioned

  
  

• 
  Parent

  
  

What is MongoDB Data Modeling?

• Unlike the structured database, where we need to determine table’s schema in advance, MongoDB is very flexible in this area.

• Also, common fields in a collection can contain different types of data. This helps in easy mapping.

• We know that MongoDB is a document-oriented database or NoSQL database.

• MongoDB deals in collections, documents, and fields.

• It is a schema-less database or we can say, it has a flexible schema / We can have documents containing different sets of fields or structures in the same collection.

The most frequent operations in a given application are

• 
  The read operations

• The write operations

• 
  The read and write operations

Which of the following pattern is more straightforward to use?

• Array of Ancestors

  
  

• Materialized Paths

• Nested Sets

• None of the mentioned